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Mathematics Questions and Answers November 30, 2019

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a) Prepare an appropriate type of frequency distribution table for one of the quantitative variables and then compute relative frequencies. b) Create a histogram and a stem-and-leaf display. Comment on any symmetric or skewness. c) Calculate the mean, median, range, and standard deviation for the variables you graphed. d) Using a class of 10,

Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct aa 9999% confidence interval estimate of the population standard deviation. 6262 6161 6161 5757 6161 5252 6060 5959 6060 6868 5858 6969 The confidence interval estimate is enter

Suppose, in the dataset, we know that the BMI of African Boys is significantly higher than that for Caucasian boys. Find the p-value for each covariate effect and determine whether BMI is a confounder of the association between ethnic group and hypertension? If so, is it a **positive** or **negative** confounder

In this year's Pre-Health program there are 335 students. Of the 335, there are 232 considering going into a nursing program, 130 considering going into a paramedic program, and 67 are considering both. a) Draw a Venn Diagram to illustrate the sample space. Be sure to include the students that are not considering either of these programs. b) Are

8. Historically, 61% of students pass an introductory statistics course on their first try.. If 77 students are randomly selected, find the probability that ... (Round the answers to 4 decimal places.) a) ... exactly 50 will pass an introductory statistics course on their first try: b) ... no more than 50 of them will pass an introductory

Subject: Statistics Explain what do you mean by Standard error mean. Give an example And answer the following.

The number of loaves of whole wheat bread left on the shelf of a local quick stop at closing (denoted by the random variable X) varies from day to day. Past records show that the probability distribution of X is as shown in the following table. Find the probability that there will be at least three loaves left over at the end of any given day.

When testing the overall regression, the test-statistic used is the log likelihood function of the model under the null hypothesis, also called the null deviance

The links are all available. Find, cite, and explain one scholarly or academic source that explains how to read a scientific research article. (How to read a scientific research paper - respiratory care. (n.d.). https://rc.rcjournal.com/content/respcare/54/10/1366.full.pdf ) Scholarly means published in a peer-reviewed journal, "academic" means

You are tasked to implement a randomized experiment in order to test the effectiveness (mea- sured in grade point averages,"GPA") of a new set of schooling material for high school students. At one high school, you are planning to randomly give the material to some subset of students, but not other students at that same school. From historic data

L= 0.3 t= 8 find P( at least one) find mux and Std.devX? L=0.3 t= 5 find P( fewer than 5) find muX and Std.DevX?

velo. com Plot the distribution of `spent` for the control (GRP A) and treatment (GRP B) groups using the facet function below. Comment on the best measure of central tendency. Do mean and standard deviation have much meaning in this distribution

An engineering firm is constructing power plants at three different sites. Define the events E1, E2, and E3 as follows: E1 = the plant at site 1 is completed by the contract date. E2 = the plant at site 2 is completed by the contract date. E3 = the plant at site 3 is completed by the contract date. For each part below, draw a rectangle for the

Would you prefer to use Savored or the daily deal? Why

Consider this argument and then identify the most reasonable conclusion. I have bought gas at Mario's Speedway Gas Station because it is always 10 cents cheaper than any other station. I bought gas there five times and at least three out of the five times, my car performed sluggishly afterwards

A correlational design ______. Question 28 options: describes the relationship between two variables examines causal relationships between three or more variables is a type of study that tests the hypothesis that variables are related determines causation between variables

The Assignment Refer to the MODULDATA 1_3 (SPSS Document), located in the Learning Resources. Use SPSS to open the dataset and complete the following: A) Developing a Research Question: 1. A researcher wants to conduct a study to see: a. If history of having stroke differs by marital status, and b. If mean score of general health rating differs by

Using the following variable scores, (IQ)=111.00, 102.00, 108.00, 109.00, 118.00, 79.00, 88.00, 102.00, 100.00, 105.00, 92.00, 84.00, 131.00, 104.00, 83.00, 84.00, 85.00, 110.00,121.00,120.00, 100.00, 103.00, 94.00, 89.00,95.00, 101.00, 93.00, and 128.00,), Of the first ten scores of the continuous variable chosen to calculate as follows. X2 (X+1)

A fair die is rolled in a board game to determine how many spaces a player can move on their turn. It has one of the numbers: 1,2,3,4,5, & 6 on each of its faces. Let even A be rolling an even number & B be rolling a number greater than 3. Identify the numbers of each of the following: There are__ outcomes in the sample space? There are __

Consider the relationship between the number of kanban cars sets needed with safety stock and the container size. Choose the most appropriate answer. As safety stock increases, the number of kanban card sets needed will decrease. As safety stock decreases, the number of kanban card sets needed will increase. As container size increases, the number

Suppose the following data are product weights for the same items produced on two different production lines. Line 1 Line 2 13.9 13.8 13.6 14.5 14.0 14.4 13.2 14.0 13.3 14.9 13.4 13.1 13.7 14.3 13.9 14.6 12.2 14.1 14.3 14.7 15.0 14.2 Test for a difference between the product weights for the two lines. Use = 0.05.State the null and alternative

Metacognition is defined as "the ability to manage one's cognitive abilities". This includes knowing how much one knows about a topic, where to find the relevant information, planning the possible solutions to a problem, choosing the best solution, and evaluating the consequences of the choice. These processes are crucial in learning, higher

What would be the best approach to represent the baseline process capability with respect to the overall Turnaround Time for Stat tests, for all hours of the day? (Note: it is inadvisable to draw any conclusions about the capability of an unstable process, but in this case, we're not making any prediction about the future, we just want to

1-. Explique cul conjunto forma la poblacin y cul forma la muestra. Cite un ejemplo de algn diario, de la TV o de Internet. Diga el tema de la encuesta , la poblacin , la muestra y el resultado. Ejemplo: En un programa de TV se realiz una encuesta donde participaron 1000 ciudadanos con derecho a voto acerca de la aprobacin de la gestin del

If the probability that a Qubcois(e) does not speak French at home regularly is 0.145, the probability that a Qubcois(e) does speak French at home regularly is: Question 10Answer a. 0.145 b. 0.755 c. 0.99 d. We do not have enough information to say e. 0.855

For the same randomized experiment, under what circumstances does Y~T+G+ E control possible bias in the vanilla specification Y~T+ E ? a) As mentioned in the previous question, controlling G for via Y~T+G+ E is never necessary. b) If in the particular sample, G and T are "accidentally" correlated (i.e. a low probability event occurs), e.g. somehow

I'm trying to figure out which is an observational study and which is an experiment

The implied power is _0.77_ (two decimal places) so we would recommend the student to __ the sample size in order to achieve higher power. [2 marks]

To construct the following data, we started with the scores in Problem 20 and scrambled the scores in Treatment 2 to eliminate the consistency of the individual differences.

The table shows the years of experience of 14 registered nurses and their annual salaries. Years of Experience, x Annual Salary (in thousands), y 0.5 40.2 2 42.9 4 45.1 5 46.7 7 50.2 9 53.6 10 54.0 12.5 58.4 13 61.8 16 63.9 18 67.5 20 64.3 22 60.1 25 65.7 2) Determine the regression line that fits this data. Write a and b exactly as they are given

Case managers in a therapeutic foster home agency completed assessments on at-risk youth who are clients of the agency. They assessed for risky behaviors as well as mental health needs. Higher scores indicate greater number of risky behaviors and greater need. Conduct the following analyses on their assessment scores for each subscale. Score Risky

Q- 4 comparison between home country of (BAT) British American Tobacco company and host country ( Bangladesh) of British American Tobacco company. I NEED ONLY TYPING ANSWER

A researcher records the weights of children enrolled in all grade 3 classes at a given school board. Which graphing method(s) would be most appropriate to display the recorded data? a histogram a bar/column graph a histogram or polygon a polygon

The frequency of traffic accidents increases in warmer weather. Does warmer weather cause folks to drive poorly? To answer, the researcher needs to consider whether there are more cars on the road when it is warmer. This "number of cars" variable must be considered to determine if the relationship between traffic accidents and temperature is

Based on his analysis of a sample of the population, the data analyst has made a conclusion about the population as a whole. This is referred to as __________________. descriptive statistics generalized statistics vital statistics inferential statistics

Whatvalueindicates whetherastockwill aid from being diversified?Howdo you evaluate it? Please only use the provided text below.

Why can a binary categorical predictor be used in a linear regression model?

(62.5, 65.1) inches is a 96% confidence interval for the average height of some FSU students' moms. The interval was constructed using data obtained from 52 FSU students. Select the BEST option for each of the blanks in the interpretation given below. We do not know if this particular interval with margin of error Blank1 contains the population

Para los siguientes datos: Continuacin del mismo problema en Modulo#5) 1, 1, 2, 3, 3, 3, 3, 3, 4, 4, 5, 5, 5 a) Calcule 1) la media o promedio 2) cuartil-1, cuartil-2, cuartil-3 3) Rango Intercuartilico 4) varianza (use formula computacional) 5) coeficiente de variacin b) Prepare un grafico Box Plot (Box and Wisker) c) Determine los valores de la

Your airline boards passengers in 5 groups. After reviewing boarding's for a year, you have created the following spreadsheet. A B C D 1 Flyers Overhead bags Cumulative bags 2 Preboarding 10 5 5 3 1st class 30 28 33 4 Premium 50 22 55 5 Main Cabin 80 37 92 6 Discount fares 30 18 110 What is the probability of a passenger being in the first two

Heights of 10 year olds, regardless of gender, closely follow a normal distribution with mean 55 inches and standard deviation 6 inches. (a) What is the probability that a randomly chosen 10 year old is shorter than 48 inches? (b) What is the probability that a randomly chosen 10 year old is between 60 and 65 inches? (c) If the tallest 10% of the

The statistics of the Starts + Stories Podcast ( stay at home) episode 169 2-3 pgs

I've shared the link on my google drive. Just copy and paste it. https://docs.google.com/spreadsheets/d/1mfeF1fg0ZaJqxmqVhFLH2F5Pjf5-yQ9u/edit?usp=sharing&ouid=106894686092121876822&rtpof=true&sd=true

Williams and Harmel (1984) developed the following regression equation that predicts whitetail buck weight (kg) based on number of antler points in the Kerr Wildlife Management Area: y = 43.6 + 7.4x. The coefficient of determination of this model is r 2 = 0.54. What percentage of deer weight is explained by the number of antler points?

The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with a mean of 2.7 pounds and a standard deviation of 1.3 pound. If a sample of 21 fish is taken, what would the standard error of the mean weight equal? (Keep three decimal places)

Can you explain this equation and give out a simple example to explain it?

Cobra Electronics sells 42 brands of USB battery packs. These battery packs are power banks used by consumers to charge cell phones or supply power to portable electronic devices in the absence of a wall charger. The prices (to the nearest dollar) of these power packs are provided below, and you are asked to organize them into a grouped frequency

Comparing the range and IQR, what does this tell us about the murder rates in the US? IQR = 3.7 Range =9.5

1. The word used to describe entities that are most dissimilar to some norm is a. standard deviation b. percentile c. outliers d. average

View the video below about how statistics can be misleading. https://youtu.be/sxYrzzy3cq8 how data/numbers can be presented in a misleading way. Provide an explanation on why it was misleading.

A researcher conducted a study regarding work-modality preferences during the pandemic. The study contained responses from 2,344 people with a margin of error of 2.96%. 23% of participants favored a hybrid mode of work, where employees reported to work on rotating days of each week. What was the sample size of this poll

Help with this statistics problem: Let's say you record the amount of thefts per 1000 in a random sample of 12 cities/towns in Worcester county during the hours of 6 am to 5pm . The numbers you record are: 12, 5, 32, 35, 17, 17, 21, 28, 22, 38, 42, 11 Construct a dot plot of the above data. Find the mean, median , and 15% trimmed mean. Locate the

I think one of the key practical uses that I will take away from this course is the expanded comfortability that I have using excel. I recently accepted a new position where I will be working with excel daily, so this was a good course to have to just get me more familiar with all the different functions and shortcuts that I can use on there. I

Customers at a coffee shop spent a mean of $9.81 per visit during December. The manager believes that customers spent significantly more per visit than the usual amount of $9.15 .The sample statistic is The population parameter is

Let yj, j=1...5, denote the binary variables representing the decision whether to open an emergency vehicles station in area j. How would you express the constraint that there should be at least one station that has a response time not greater than 8 minutes in area 2? Let yj, j=1...5, denote the binary variables representing the decision whether

A child psychologist investigated the effects of bilingualism on cognitive development. She assembled an equal number of 3, 4, 5, 6, and 7-year-old children. For each age level, half the kids were fluent in two languages, and half spoke only English. She showed each child a tower built from 5 Duplo blocks and explained that each block represented

Answer the following questions. 1. What are the sample mean racial implicit bias levels for the three groups? 2. What is the F-statistic? 3. Are the differences in means statistically significant if alpha=0.05? 4. Do you accept or reject the null hypothesis? 5. Using the results of ANOVA, explain the differences, if any, among the groups. Use

Research supports the use of technology to increase the frequency and quality of student writing. This finding is believed to be a result of:

Choose the correct statement below: Question 3 options: Linear regression coefficients are chosen such that total sum of square is minimized, which is the total squared distance of the actual observations to the mean of y Linear regression coefficients are chosen such that regression sum of square is minimized, which measures the distance from the

Propsito: Identificar las mejores opciones y recursos posibles lograr la mejor alternativa posible en cada negociacin

In a certain store, there is a .03 probability that the scanned price in the bar code scanner will not match the advertised price. The cashier scans 800 items. (a) What is the expected number of mismatches? The standard deviation? (b) What is the approximate normal probability of at least 20 mismatches? (c) Of more than 30 mismatches? Show your

A Nielsen study indicates that 18- to 24- year olds spend a mean of 174 minutes watching video on their smartphones per month. Assume that the amount of time watching a video on a smartphone per month is normally distributed and that the standard deviation is 15 minutes. a. What is the probability that an 18- to 24-year-old spends less than 150

We treat the entire inputs of the variable "wgtviccy" as a population. Now, calculate the population mean, mu Hint: the population size is 65,640 so we will need to use SPSS to perform the calculation. Round to the nearest whole number

As a master's scholar, if you have a set of qualitative data, explain how the descriptive study can be applied.

The changes in milk quality in the market, starting from government established standards and actual product data in the market, compare the changes in milk quality in China, Hong Kong, and the United States over the past 15 years (requiring data on protein, lactose, somatic cell count, colony count, etc.). Or directly provide me with a survey on

In the DRO fixed-interval schedule, the interval is started over every time the inappropriate target behavior occurs. a. True b. False

The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of 98.34F and a standard deviation of 0.59F. Using the empirical rule, find each approximate percentage below. What is the approximate percentage of healthy adults with body temperatures within 2 standard deviations of the mean, or between 97.16F and

Suppose you are estimating the following multiple regression model using 3,200 observations: y=0+1x1+2x2+3x3+4x4+5x5+u After estimating the model with OLS, you propose the following hypothesis: H0: x5=0 , x4=0 , x3=0 . You would like to test this hypothesis with an LM test; however, you are unsure whether the model suffers from heteroskedasticity.

the US department of transportation reported that in a large study of mobile phones use while driving conducted in 2015 4.5% of female drivers observed and 3.5% of male drivers observed were using a handheld phone while driving. n suppose that these percentages were based on observations from independent random samples of 1400 male drivers and

Consider Randome Variables X,Y uniform on triangle with vertices (-3,0), (3,0), and (0,2). Find 1. Joint pdf 2. Marginal pdfs 3. E(X), E(Y) 4. Var(Y)

Pregunta 6 Se quiere realizar una investigacin con los estudiantes de Justicia Criminal. Se obtiene un listado en la Oficina de Registradura de los estudiantes de Justicia Criminal y se dividen segn los crditos que tienen aprobados: 3-9, 10-16, 17-23, 24-30, 31-37, 38 o ms. Qu tipo de muestreo se utilizar? Grupo de opciones de respuesta: por

Factor Weight Scores for Supplier A Scores for Supplier B Scores for Supplier C Software Design 0.25 16 38 28 Image Recognition accuracy 0.15 45 10 51 Cost 0.15 43 40 9 User Friendly 0.05 42 43 26 Equipment Design 0.05 11 35 51 Serviceability 0.15 43 15 10 Reliability 0.20 12 45 43

F-Test Two-Sample for Variances Self-Service Checkout Sales Employee Operated Checkout Sales Mean 36,709.11 46,995.93 Variance 56,649,037.54 401,208,905.56 Observations 180.00 180.00 df 179.00 179.00 F 0.14 P(F

Look at 5 different charts for your specific area of interest (i.e. business, healthcare, agriculture, gaming, etc.). with what insights you draw from the charts?

A nominal scale refers to when data can only be placed in separate categories

What statistical test is typically used when groups have been matched in an experiment? Independent-samples t-test. Chi-squared test. Dependent-samples t-test. ANOVA

On the graph below, the initial occurrence of prediction occurs during which condition?

The answers are: precision and statistical power or the privacy and convenience of the respondents

Questions: When is it best to use the mode as a measure of center? Describe what type of data would lead you to choosing the mode over the mean or median. 1 sentence If a set of numbers has a standard deviation of zero, what can you say about the numbers? ] If a set of grades for a class has a large range and a small standard deviation, what can

What is the probability of rolling two dice and getting 5 or 6 on both of them? (Give you answer as a decimal number rounded to two decimal places.)

There is a probability of 0.68 that a person will enter a store with a creative window display. Suppose that a number of potential customers walk by Find the probability that the fourth person will be the first customer to enter the store. (Round your answer to three decimal places.)

Suppose that people who study very hard for the MCAT have an odds of 1.63 of getting a score they feel comfortable with and do not feel the need to retake the MCAT. Suppose that people who do not study for the MCAT have an odds of .79 of getting a score they feel comfortable with and do not feel the need to retake the MCAT. What is the Relative

Which restaurant comes" closest" to being an "outlier" in a statistical sense based upon the regression model above A: Red lobster B: Joe's Crab Shack C: Bertuucci's D: uno Chicago grill

A population survey is conducted on their level of education, and a sample of 445 random individuals is used. A total of 25 out of the 455 random participants have an educational doctorate. What formula and process do I use to give the breakdown of participants (with doctorate degrees), determine the point estimate, and then construct the 95%

Problem 1 Let X be a discrete random variable with the following PMF: 1 1-2 for x = 0 1-3 for x = 1 Px(x) = 1-6 for x = 2 0 otherwise a. Find R X' the range of the random variable X. b. Find P(X >= 1.5) . c. Find P(0 < X < 2) . d. Find P(X=0| X < 2 )

The two Excel based projects will focus on applications of linear equations and linear least squares regression. All projects must be printed on letter size paper.No electronic copies or handwritten ones will be accepted.All content must be printed - no handwritten mathematics, graphs, labels, etc.All projects must be stapled. Students can work

Assume exponential distrbution. To verify a 500,000 hours MTTF, how many test units do we need? At 90% confidence level and a test duration of 2500 hours and 2 failures are allowed

Female concern for the mistreatment or bias shown towards their sex in society is worthy of a voice (Cohen, 2013; Rosin, 2010, 2014); Men have dominated upper class roles at the expense of low female wages for, sometimes, equal positions (Cohen, 2013; Rosin, 2010, 2014).However, a switch has been flipped as men are now traveling to the bottom of

4. A new test is developed for cancer detection with sensitivity 0.80 and specificity 0.91. Assume this cancer affects 6% of the population. Calculate the probability that an individual does not have cancer if their test result is negative

El Reglamento, que se supona que era un "instrumento capaz de estimular a los hombres tiles a dedicarse al trabajo", se convirti en un sistema de opresin por varias razones: Control estatal: El sistema de racionamiento permiti al gobierno controlar la distribucin de alimentos y bienes bsicos, lo que le dio un gran poder sobre la vida cotidiana de

We can also use a least-squares regression line to predict the number of wins for a team on their number of points scored. Here is a scatterplot relating x= number of points scored and y = number of wins, along with the least-squares regression line 7=-74.5667 + 0.0331x

Questions 1. Name the Independent Variable and the two levels. 2. Name the Dependent Variable and its scale of measurement. 3. Calculate the measures of central tendency (Mean, Median, Mode) for each group. 4. For the Short Sleep group, compare to median - what is the shape of the distribution? 5. For the Healthy Sleep group, compare to median -

please help with these health stats questions and provide SAS codes if possible: 1. Researchers in the Faculty of ENV conducted a study to determine whether undergraduate students recognize climate change as a critical issue. In the study, a response of 1 indicates that a student recognizes climate change as a critical issue and a response of 0

The proportion p of residents in a community who recycle has traditionally been 70%. A policy maker claims that the proportion is less than 70% now that one of the recycling centers has been relocated . If 131 out of a random sample of 205 residents in the community said they recycle, is there enough evidence to support the policy maker's claim at

Please use Excel(Scroll down for Data) Question1: Perform a three point moving average and forecast demand, in pounds, for salt for the first quarter of year 4. Please round to the nearest whole number. Q2: Write down the MAD for the three point moving average. Please round to two decimal points. Q3:Perform exponential smoothing (alpha= 0.2) and

In general, if a compound was effective against E. coli is it most likely effective against S. epidermidis? To answer this question, perform a linear regression analysis, using the penicillin2 dataset and treating E. coli as the x-variable

What is the sample size, mean, standard deviation, minimum, 1st quartile 2nd Quartile, 3rd quartile and 4th quartile of weight variable

Consider the experiment of tossing a fair coin three times. A sample point for this experiment must indicate the result of each toss. For example, HHT could indicate that two heads, then a tail were observed. Let Hi, where i=1,2,3, denote the event that the ith toss is head. For example, H1={HHH, HHT, HTH, HTT}. Answer to the following questions

I'm doing an assignment on R studio and am unsure what this function indicates.

Anlisis de categoras y subcategoras del examen de revlida y diseo de un plan de estudios

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