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Mathematics Questions and Answers January 02, 2022

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In a large clinicaltrial, 399,655 children were randomly assigned to two groups. The treatment group consisted of 198,941 children given a vaccine for a certaindisease, and 30 of those children developed the disease. The other 200,714 children were given aplacebo, and 92 of those children developed the disease. Consider the vaccine treatment group

Suppose you are taking a multiple choice exam with 73 questions, each with 4 possible answers. If you were to guess at random for each question, how many questions would you expect to get right?

Descriptive statistics of research scores allow researchers to Blank______. Multiple choice question. make precise statements about the obtained data obtain informed consent from participants accurately interpret the data with only the variability statistic avoid sampling errors

The google doc info is the two set of mean above numbers above sample size 5 and sample size 20 My set of means from the size 5 data( 4 means) (54.8, 27.6, 43.8, 29.6 ), (32.6, 67, 32.4, 39.8), (44.8, 51.2, 45, 42.8),(53.2, 69.6, 33.6, 45.4),(27.2, 52.8, 67.4, 71), (65.2, 57.6, 25, 76.4), (54.4, 59.4, 33, 50.6), (54.4, 59.4, 33, 50.6) , (62.6,
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Use the graph of H shown to the right to find the limit. When necessary, state that the limit does not exist. lim H(x) X-4 x Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. lim H(x) = (Type an integer or a simplified fraction.) X-4 B. The limit does not exist
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What does the prefix "a" mean? a. Toward b. Without c. Two d. Above

Which of the following statement is true about scatterplot? Question 15 options: The trendline in a scatterplot must be a straight line Scatterplot helps us detecting relationships between any two types of variables All the statements are true A trendline is a line or curve that "fits" the scatter as well as possible

Can some one answer this question A student suspects that an e-commerce company is tracking her online shopping history, and not giving her best prices on items that she is likely to buy. She opened another account with the company using the computer at her work place. From her new account on her workplace computer, she looked up the displayed
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A health educator was interested in determining whether college students at her college really do gain weight during their freshman year. A random sample of 5 college students was chosen and the weight for each student was recorded in August (the beginning of the freshman year) and May (the end of the freshman year). Does the data below suggest

For the Old Faithful study, which of the following statement accurately describe the results of the requirement check for inference involving a linear regression? (Select all that apply.) Group of answer choices There is a linear relationship between the variables because the scatterplot shows a "hot dog" shape and the residual plot shows random

On the way to the airport on December 8, 2011, my wife's car hit a huge hole in a construction area, damaging the front right wheel. The temporary tire forced us to decrease our average speed by 15 miles per hour. If the 39-mile drive usually takes us 45 minutes, how much time should we have budgeted for the drive home from the airport?

Why is intellectual and cognitive loss overestimated in the elderly? Group of answer choices This population is tested less compared to others. The elderly don't actually have loss. They are tested on mundane, meaningless tasks as the standard. There are other things contributing to this loss

A random sample of 15 customers in two different banks were selected and their wait times(in minutes) are given below. Use this data to complete parts(a) through(d). Bank A Bank B 3.55 9.66 3.14 5.87 4.35 8.06 6.19 5.81 0.35 8.69 5.21 3.75 6.39 8.14 6.12 8.39 3.77 10.49 4.29 6.74 5.61 5.61 3.05 4.04 5.09 6.08 4.69 9.99 2.34 5.47 A) Compute the

Paso 1. Mara va de compras en esta tienda. Mire el dibujo y complete el dilogo entre Mara y la vendedora opens in a dialog con el adjetivo demostrativo apropiado. mara: suter negro aqu me gusta mucho. Cunto es? vendedora: Treinta dlares. mara: Y faldas largas all? Cunto cuestan? vendedora: Setenta dlares. mara: Me gustan mucho blusas all. Estn de

Which of the following statements are true? Question 19 options: Probabilities must be negative. Probabilities can either be positive or negative. Probabilities must be nonnegative. Probabilities can be any positive value

Completa el enunciado con las palabras correctas para que tenga sentido. Quieres saber ________existe la corrupcin?________ los sueldos son muy bajos y hay una crisis de principios morales

Using a calculator or statistical software, find the linear regression line for the data in the table below. Enter your answer in the form y = m x + b , with m and b both rounded to two decimal places. x y 0 3.67 1 5.24 2 7.04 3 10.31 4 9.83 5 11.04 6 14.68 7 15.02 Provide your answer below: $$

Creating the action plan Given your line of thought, what action should you perform before inputting the price, mileage and top speed values? Predict the sales of your new models Hypothesis tests on the performance of the new models. Calculate the profit you will make from each model. Invest in Marengo32 because it gives you more profit per car

1) Identify all critical points, and asymptotes of the function if exist, and explain the behavior for each of them. f ( x ) = ( x 2 + 5 ) / ( x 2 9 ) 2) Given the following function: f(x)= s q r t ( 1 x 2 ) ( 4 x 2 ) . Find the horizontal and vertical tangent lines, if they exist.

Define a sequence a n recursively by by a 1 = 2 and a n + 1 = 3 1 + a n 1 . Find the limit of a n . .

(0.5 pts) Set the random seed to 10. Create another random sample X2_men of 100 height values using the same mean and standard deviation. Evaluate the difference of the means of these two samples (i.e. mean of X1_men - mean of X2_men). In real life, what do we expect this difference of means to be? 0? 0] : # Your answer here np . random. seed (10)
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c) Sobre la base de la tendencia histrica del ltimo trimestre proyecte la inflacin para octubre. d) Calcule la inflacin promedio quincenal registrada en julio. e) Asumiendo que la inflacin de octubre ser del 3% proyecte el nmero ndice para ese mes

In a study of children 3 through 8 years (age assumed continuous), an investigator examines how race (white/black/other) and age impact performance on a reading test. Scores on the reading test are measured on a continuous scale and can range from 0 to 100. Using unknown (unestimated) parameters, write down the regression function, defining all

In your initial post, respond to following discussion prompt. The actor.xlsx file is provided in the Data section below along with directions for creating the histogram. Describe the distribution of ages of the Best Actor Oscar winners. Your description should include: shape, center (a typical representative age), a typical interval of

thanks for the help The annual rainfall in a certain region is approximately normally distributed with mean 41.2 inches and standard deviation 5.6 inches. Round answers to the nearest tenth of a percent. a) What percentage of years will have an annual rainfall of less than 44 inches? |:|% b) What percentage of years will have an annual rainfall of
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Assume that a set of test scores is normally distributed with a mean of 120 and a standard deviation of 15 . Use the 68-95-99.7 rule to find the following quantities. The percentage of scores less than 120? (Round to one decimal place as needed.)

At a manufacturing company in the Midwest, an OD practitioner distributed surveys which use a Likert scale across the organization to evaluate the organizational climate. What sort of data is s/he working with? Multi-Method Qualitative Significant Amounts Quantitative

\f\f\fProblem 1: (26 points) Can the size of a person's head be used to predict the weight of their brain? The head size (in cm) and brain size (in grams) for 237 adults are given in the brainhead.csv (and brainhead.txt) data set. Import the data set into R at this time. Here is the documentation for the data set: Column VWariable Description 1
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Please calculate: Frozen computer: A computer system administrator noticed that computers running a particular operating system seem to freeze up more often as the installation of the operating system ages. She measures the time (in minutes) before freeze-up for 6 computers one month after installation and for 6 computers seven months after
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Communicate Your Understanding 1. Describe how you would solve each of the following triangles. Justify your chosen method. A b) D -240 7 m 8 m 18 m E 14 m 370 B C C d) X 10 cm 123 12 cm 33 m Y Z 1140 18 m SM R K 24.20 d) In 4 1010 8.3 12.8 U = 27 k 33 P e) In 41. 10 z = 2 f) In h= 2. Find the measure of the indicated angle, 4. to the nearest
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The data is suitable for regression analysis as it is normally distributed, includes dependent variable data presented in the first four tables, and exhibits a linear relationship between variables

You are the CEO of an aircraft manufacturing company, automotive company, or general manager of a professional sports team. How would you use correlation and linear regression to improve product or player performance? What would be your dependent and independent variables? Share your thoughts with the class, and discuss why you selected the topic

You are planning to conduct a qualitative research study on a topic of your choice. Through readings, you found that it is based on a certain process which is divided into phases. a)What are the phases of qualitative research process? b)How will you implement these phases in your research study?

10. True/False: The mean, Xchart does not have to be use with the range, Rchart when you monitor process variation through control charts. Answer: ( )
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Five police officers at the woodlands form a sample space. Let be an event that the officer's name starts with an A. Find.

Approximately 7/20 of the world's total population live in China and India, combined. In late 2021, the world's population was about 7,900,000,000 (that's 7 billion, 900 million) people. Use this information to write a multiplication problem to approximate the population of China and India, combined, in late 2021

WHY IS STATISTICS SO IMPORTANT TODAY IN A POST-TRUTH ERA?

A researcher is interested in studying how exposure to blue spectrum light (the light emitted from smartphones and other technology devices) can influence sleep quality. She randomly assigns one group of participants to use no technology before bed for 1 week, and a second group of participants to look at a smartphone or tablet for 1 hour before

answers 9. You are curious about how people feel about craft beer, so you gather data from 55 people in the city on whether or not they like it. You code your data so that O is neutral, positive scores indicate liking craft beer, and negative scores indicate disliking craft beer. You find that the average opinion was M = 1.10 and the spread was s
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The sample that I expect to use for my research project is a sample of first year university students, age 18 and up. The sampling technique I propose to use is a form on nonprobability sampling called convenience sampling. According to Cozy & Bates (2024), convenience sampling, otherwise called haphazard sampling is a form of sampling where you

Give a recursive definition for the set Y of all positive multiples of 8 . That is, Y = {8,16,24,32,40,48,56,64,72,80,88, ... }. Your definition should have a base case and a recursive part. B. ?is in Y . R. If y is in Y , so is?.

Los valores indicados son discretas. Utilice la correccin de continuidad y describa la regin de la distribucin normal que corresponde a la probabilidad indicada. La probabilidad de no ms de 75 CD defectuosos. El rea a la derecha de 75.5 El rea a la izquierda de 75 El rea a la izquierda de 74.5 El rea a la izquierda de 75.5

In the Week 1 Reading Assignment, "Catan - Fair Dice" the assumption was made that the direction of extreme is one-sided to the right. Calculate what the correct p-value would be if the assumption for direction of extreme was changed to two-sided. The new p-value would be [p-value] : _________________ (Answer Typed)

As a general rule, a process improvement initiative should follow these guidelines: Group of answer choices Move the center of the distribution to the target value Increase the standard deviation of the process Reduce the variation of the process Focus on C first, then follow with A

Question 5 You wish to test the following claim (Ha) at a significance level of a = 0.02. Ho : p = 0.73 Ha : p # 0.73 You obtain a sample of size n = 156 in which there are 106 successful observations. What is the critical value for this test? (Round answer to three decimal places. ) critical value = # What is the test statistic for this sample?
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From the standard deviation, we know something about the Question 4 options: general location of most scores within a scores distribution. spread of scores within the scores distribution. shape of the scores distribution frequency at each score value

Problem 16-01 (Algorithmic) The management of Brinkley Corporation is interested in using simulation to estimate the profit per unit for a new product. The selling price for the product will be $45 per unit. Probability distributions for the purchase cost, the labor cost, and the transportation cost are estimated as follows: \f
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A highway rest area contains a vending machine that dispenses cups of coffee. The amount of coffee that the machine provides when a purchase is made approximately follows a uniform distribution between 200 and 250 ml. (a) The probability that a randomly selected cup will contain more than 234 ml is. (b) The probability that a randomly selected cup

A criminologist was interested in the gender difference of the level of self-control and randomly surveyed 10 male college students and 10 female college students. The scores (20 is the highest level of self-control) reported by the respondent are as follows: Male Female 10 18 13 14 9 15 12 10 7 14 11 8 11 16 9 9 9 11 12 15 From performing a

We like to snorkel a lot out here in Guam. Beautiful fish and sea turtles. For this example, assume that a family of four goes snorkeling, and the probability that any one person will see a sea turtle is 0.70 (which is true! I swim with the turtles just about every time I go out): a) Find the probability that only one person will see a turtle. b)
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The regression equation is used to... Question 1 options: ...predict the value of the response variable given a value of the explanatory variable ...predict the value of the explanatory variable based of the response variable ...measure the association between two variables all of the above none of the above What does it indicate if r = -1.00?

Which of the following tools highlights which factors are more significant on a bar graph? Checklist Cause and effect diagram Histogram Pareto chart

1: A manager wishes to compare the overtime expenses he has accrued for his office over the last 12 weeks to the company average of $2200. Using a single-sample t-test, test the hypothesis that a need exists to reduce overtime expenses for his office. The following data represents his overtime expenses for a 12 week period

Suppose that you have at your disposal the information below for each of 30 drivers. Propose a model (including a very brief indication of symbols used to represent independent variables) to explain how miles per gallon vary from driver to driver on the basis of the factors measured. Information: miles driven per day weight of car number of

6. Suppose Group A had a variance of 100 while Group B had a standard deviation of 11. Which group has more variability in its scores? a. Group A b. Group B c. The two groups have equal levels of variability d. This question cannot be answered without additional information 7. After a recent debating tournament, you found out that your debating

Describe the use of the following statistical terms in analyzing and interpreting a data set: Arithmetic Mean Sample Standard Deviation Population Standard Deviation (why is the equation for this metric different than the sample standard deviation equation) Z-Scores Correlation Suppose you have data with multiple variables (columns) and you have

Complete part D and E A silver dollar is dropped from the top of a building that is 1327 feet tall. Use the position function below for free-falling objects. s(t) = -16t2+ Vot+ 50 (a) Determine the position and velocity functions for the coin. s(t) = -167+ 1327 V(t) = 32t (b) Determine the average velocity on the interval [1, 2]. -48 ft/s (c) Find
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: Regression, multiple regression, one-sided t-test, or two-sided t-test. All conclusions should be based on 5% P -value threshold. Choose the best fitting answer. Open Brainsdata. SETUP : Some people believe that second born subjects are more intelligent (higher IQ test). Given the data, your job is to perform the appropriate statistical test or

Determine whether each variable listed is discrete or continuous. Number of tablets in an ibuprofen bottle Number of books on each shelf in the library Amount of time spent waiting in the pharmacy drive thru A person's shoe size Weights of cats a vet technician sees in one day a. Discrete b. Continuous

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Below a random sample of ten weekdays from three shops. The data collected was daily sales(in thousands of dollars). Shop 1 Shop 2 Shop 3 6 1 26 7 2 27 8 3 28 9 4 29 10 9 30 11 11 31 11 16 31 12 17,5 32 13 18.5 33 14 19 34 1) Find the mean and sample standard deviation of daily sales for Shop 1 2) Comment on how the daily sales distributions of

A landscaping company has collected data on home value r 14 households. Home Landscaping Value Expenditures ($1,000) ($1,000) 241 8 .2 322 10.9 197 12.3 340 16.3 300 15.7 400 18.8 800 23.5 200 522 17.5 546 22.0 438 12.2 463 13.5 635 17.8 357 13.8 (a) Develop a scatter diagram with home value as the independent variable. 900 900 800 700 20 8 700
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Determine the probability of the treatment group's mean being greater than the control group's mean by 8 points or more. Then complete the statements

In your own words, please define p-value. Discuss with your classmates, what a p-value is and how to interpret its value. Typically, a p-value of 0.05 is used as the significance level. This means that if p > 0.05 wefail to rejectHo (null hypothesis). If p < 0.05 we reject Ho. Discuss whether or not you think 0.05 is too strict or too liberal a

Now that you have a sense of how changing the sample size affects the statistical significance of the statistical finding, what about the size of the difference between the sample statistics? How does an increase in the difference between the sample statistics change the probability of rejecting the null hypothesis? The probability of rejecting

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Osmar Ltd conducted a study to determine the lifetimes of the light bulbs produced by their Melbourne plant. Based on studies in other plants, it could be assumed that the variance of the lifetimes was80000 hours squared. Experimental testing of52 light bulbs yielded an average lifetime of 26 hundredhours. Construct a 90% confidence interval for

In order to determine the average weight of carry-on luggage by passengers on a particular airplane, a sample of 22 pieces of carry-on luggage was weighed. The average weight was 9 kg. It is known that the weight of carry-on luggage is normally distributed and that historical data has shown the standard deviation is 3.45 kg.Determine the critical

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. Livability rankings for cities Question content area bottom Part 1 Choose the correct level of measurement. A.Ordinal Ordinal B.Nominal Nominal C. Ratio D. Interval

Travelocity would like to test if the average roundtrip airfare between New York and London is less than $1,400. A random sample of 30 flights between New York and London was selected and the airfare was recorded. Assume that the standard deviation for the population of airfares between these two cities is $230 and the true population mean for

I need help with this question. A random sample of size 35 was taken from a population that followed a right skewed distribution with a population mean of 18 and a population standard deviation 8. Determine each of the following: Round your response to at least 3 decimal places where appropriate. 0) Suppose we want to fin the 84th percentile of
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3.Benign prostatic hyperplasia is a noncancerous enlargement of the prostate gland that adversely affects the quality of life of millions of men. A study of a minimally invasive procedure for the treatment for this condition looked at pretreatment quality of life (QOL_BASE) and quality of life after three months on treatment (QOL_3MO). The data is

A hat contains five slips of paper, numbered 1,2,3,4, and 5. Two are chosen at random, without replacement, and a random variable, X, is the sum of the two numbers. Write down the possible values of X and their probabilities; from them find the expected value.

PROBLEM: You are interested in interviewing people who own both a cat and a dog.The estimated incidence rate in the population is 7%.You expect a survey completion rate of 55%. (1) What final sample size would be required to obtain a statistical estimate of a parameter with an expected proportion of 50% within +/- 3% with 95% confidence? (2) Based

Los datos siguientes muestran la estatura(enpulgadas) y el pulso(enlatidos porminuto)de una muestra aleatoria de mujeres. Responda las partes a-c . \f
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Using Essential Bundle Food Data, Compute two conditional probabilities to compare the relationship between the two (or more) categorical variables. Use appropriate notation and write a sentence interpreting each probability. Show your work

Consider a drug that is used to help prevent blood clots in certain patients. In clinical?trials, among 5791 patients treated with this?drug, 154 developed the adverse reaction of nausea. Use a 0.05 significance level to test the claim that 3?% of users develop nausea. Does nausea appear to be a problematic adverse?reaction? Identify the null and
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The legislature of Puerto Rico consists of a 27-member Senate and a 51-member House of Representatives. How many ways are there to choose a group of six members from the Puerto Rican legislature?

Question : A group of friends decided to visit hill station (say H) in their vacations. To reach their destination they can follow two routes. The first directly connects K to H, whereas the second passes through G. Sometimes because of the weather conditions (snow falling), travelers cannot travel between K and H. If there is a forecast of snow

The average score on an exam was 82 ( = 82) with a standard deviation of 6.3 ( = 6.3). Find the scores that mark the middle 95% of the distribution of scores. Stated another way, 95% of the scores will be expected to fall between _______ and _______

Hans Rosling notes that "...Swedish top students know statistically significantly less about the world than the chimpanzees"? Explain what he means by this and propose some steps you can take to stay ahead of the chimps in your knowledge of population health

QUESTION: Part (b) will be posted in the comments ( Its a answer first, see next question after) A study of 420,020 cell phone users found that 140 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0315% for those not using cell phones. Complete parts (a) and
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The U.S. Department of Energy's Fuel Economy Guide provides fuel efficiency data for cars and trucks (U.S. Department of Energy website, February 22, 2008). A portion of the data for 311 compact, midsize, and large cars follows. The column labeled Class identifies the size of the car: Compact, Midsize, or Large. The column labeled Displacement

The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using premium fuel is a normally distributed random variable with a mean of = 19.50 mpg and a standard deviation of = 1.50 mpg. (a) What is the standard error ofX, the mean from a random sample of 9 fill-ups by one driver? (Round your answer to 4 decimal

can someone please show me step by step how to solve this jackson network queueing problem? thanks Cansider the following network, shown: This is a Jackson network where services are exponential with rates u1,u2,p3,p.4, and [1.5 at nodes l,2,3,4, and 5 respectively. Each node has one server and innite queue capacity. There are two types of
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The wald statistic for a "helpful safety behaviors" is the largest, indicating that changes in this variable are the most strongly associated with the changes in the dependent variable. The p-value for the 'helpful safety behaviors' is less than 0.001, which is statisctiaclly significant and this means that the likelihood of the observed

Nine experts rated two brands of coffee in ataste-testing experiment. A rating on a7-point scale (1 equals = extremely unpleasing, 7 equals = extremely pleasing) is given for each of fourcharacteristics: taste,aroma, richness, and acidity. The accompanying data table contains the ratings accumulated over all four characteristics. Complete parts(a)

The probability of X being no more than a: P(X > a) P(X a) P(X < a) P(X = a) P(X a) Incorrect The probability of X being at least a: P(X = a) P(X < a) P(X a) P(X a) P(X > a) Incorrect The probability of X being at most a: P(X a) P(X = a) P(X a) P(X > a) P(X < a) Incorrect The probability of X being no less than a: P(X < a) P(X = a) P(X a) P(X > a)

3. 5.24 Penalty Shots in World Cup Soccer. A study of l 38 penalty shots in World Cup Finals gamcs between 1982 and l994 found that the goalkeeper correctly guessed the direction of the kick only 41% ot'the time. The article notes that this is \"slightly worse than random chance." We use these data as a sample ot'all World Cup penalty shots ever.
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An acceptance sampling plan has lots of 500 pieces and a sample size of 60. The number of defects in the sample may not exceed 2. This plan, based on an OC curve, has a probability of 0.57 (57%) of accepting lots when the incoming lots have a defective rate of 4.0%, which is the historical average of the process. For the customers, the average
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The smoothing constant, = 0.40 Actual demand for Thursday, A t1 = 48 The forecasted demand for Thursday, F t1 = 77.60 The forecast for Big Mac demand for Friday, F t = F t1 + (A t1 F t1 )

probability 5. A customer survey reported that 90% of new generation light bulbs still work after 5,000 hours and that 45% still work after 10,000 hours. If a light bulb still works after 5,000 hours, calculate the probability that it will last 5,000 hours more. 6. A lab invented a diagnostic test for COVID-19. Suppose the probability of a correct
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so e^[PJP-1]=Pe^JP-1 because of the consequence of using the infinite sum

With the current flourishing use of technology in education, a school district wants to conduct a study to determine which high-tech, the student-centered instructional method would be more successful in preparing students to take standardized tests in the district. You are hired as a statistician for the district to help them elucidated this

There's 5 questions in total, thank you! A student at a four-year college claims that average enrollment at four-year colleges is higher than at two-year colleges in the United States. Two surveys are conducted. Of the 35 two-year colleges surveyed, the average enrollment was5069with a standard deviation of4774. Of the 35 four-year colleges

A candy company is introducing a new brand of chocolate to the market. They have advertised heavily, investing $8,000,000 in New York, but no ads were run in Boston. After analyzing the data, they have found no statistically significant difference between their sales in New York and Boston. Why is this an example of inferential statistics

1. [3 pts] Using Essential Bundle Food Data construct a two-way table [2 pts] Identify your explanatory and response variables

transportation calculus logistic function, exponential and surge

Sleep apnoea is a sleep disorder that causes a person to stop breathing momentarily and then awaken briefly. A study of537 Victorian commercial truck drivers found that 98 of them suffered from sleep apnoea. Use the survey results to estimate, with 93% confidence, the proportion of Victorian commercial truck drivers who suffer from this sleeping

You conducted a 2-group independent t-test with MFPAY as the grouping (independent) variable and TIPAMT as the dependent variable. The mean tip amount for males, the mean tip value for females and the t-statistic were 3.46, 2.21, 3.68. Given the t-statistic value you would conclude Select one: a. Females leave more tip than males b. Males leave

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