Mathematics Questions and Answers December 17, 2019

Coffee The National Coffee Association reported that 64 of U.S. adults drink coffee daily, A random sample of 275 U.S. adults is selected. Round your answers to at least four decimal places as needed. Part 06 Part 1 of 6 (a) Find the mean jin The mean je is P ala

The shrimp survey data (Examples 1 and 2) give a covariance function c(x) 5.1 exp(0.49x), where x is distance in nautical miles. The catches at sites 1 and 2, which are 3 nmi. apart, are 1.200 and 2.400, respectively (units are in thousands of pounds). Predict the catch yo at a new site 1 (a) Halfway between sites 1 and 2 (b) 5 nmi. from each of

20. AlcoholImpaired Driving You wish to estimate, with 95 confidence, the population proportion of motor vehicle fatalities that were caused by alcoholimpaired driving. Your estimate must be accurate within 5 of the population proportion. a. No preliminary estimate is available. Find the minimum sample size needed. b. Find the minimum sample size

Backwards 3 Given a discrete time system, time normally moves forwards in the sense that the system may start at a time k 0 then iterates through times, 1, 2, 3, 4, etc. A system operates backwards in time if it is initialized at time time K and then iterates through K 1, K 2... (a) For the Fibonacci iteration xk1 axkbk1 (6) with a b 1.

The owner of Reliable Furniture studied the relationship between sales (y) and the amount spent on advertising (x). A random sample of 3 homes gives the following information. (x1)19, (y1) 19, x2 24, y2 28, x3 28, y330 The correlation coefficient is equal to (Round answer to three decimal places ex. 2.091)

10.68 A randomized block design yielded the ANOVA table shown here Source Treatments Blocks Ho df SS MS F Error 428 501 125.25 9.109 225 112.50 8.182 110 13.75 1 Total 14 836 a. How many blocks and treatments were used in this experiment b. How many observations were observations were collected in the experiment c. Specify the null and alternative

A random sample of size n 14 is selected from a normal population with a mean of 75 and a standard deviation of 9.A second random sample of size n 7 is taken from another normal population with mean 69 and standard deviation 12. Let X1 and X be the two sample means. Find (a) The probability that X1 X2 exceeds 4. (b) The probability that 4.4 X X

13. A new assemblyline procedure to increase production has been suggested by Mr. Mump. To test whether the new procedure is superior to the old procedure, a random sample of 15 assembly line workers was selected. The number of units produced in an hour under the old procedure is determined, then the new Mump procedure was introduced. After an

Be Nice to Pigeons, As They Remember Your Face In a study conducted in Paris, France, equal amounts of pigeon feed were spread on the ground in two adjacent locations. A person was present in both sites, with one acting hostile and running at the birds to scare them away and the other acting neutral and just observing. The two people were randomly

chapter 3.2 problem 52 statistics for the data in excersice 48 estimate the number of internet plans whose cost is a-$52.43,b-less than $87.74,c-betweenZ$52.43 and $ 64.20

Suppose you are comparing performance of two classifier models using the t-test we discussed. You performed 5-fold cross-validation obtained the following result: Iteration E1 E2 1 0.15 0.08 2 0.12 0.19 3 0.05 0.09 4 0.15 0.12 5 0.13 0.21 how to calculate T-stastic

Consider that n subjects give data, (1,11,12),...,(n,n1,n2), which are statistically independent and satisfy the model = 0+ 11 +22 + where 1 and 2 are non-random regressors and is a random error. a) Construct test for significance of each regressor such that the probability of falsely concluding that 1 is significant or falsely concluding that 2

When a roulette wheel is spun a ball ends up on one of the 56 numbers located on it. 21 of the numbers are black, 14 are red and 20 are gree. What's the probability that the ball ends up on a number that is not red(give answer from fraction form)

7. An analysis of variance test for one factor with m groups was significant. How many comparisons are there to make? a. m2 - m/5 b. 2m2 - 2m c. m2/2 + 0.2m+1 d. 0.5m2 + 0.5m - 1 and. 0.5m2 - 0.5m

Explain 3. Which of the following is NOT a statistic? a. p b. Y C. TT d. Sy

3. Which of the following is NOT a statistic

The Real Estate Group NY reports that the mean monthly rent for a one-bedroom apartment without a doorman in Manhattan is $2984. Assume the standard deviation is $591. A real estate firm samples 104 apartments. What is the probability that the sample mean rent is less than $3,047.75?

A die is rolled twice. Determine, to the nearest hundredth, the probability that the first roll is greater than 2, and the second roll is less than 3. A/ ILS

n a recent survey, it was found that the median income of families in country A was $57,100. What is the probability that a randomly selected family has an income greater than $57,100?

Mr. Boutros wants to invest up to $20,000 in two stocks, Cal Computers and Texas Tools. The Cal Computers stock is expected to yield a 16% annual return, while the Texas Tools stock promises a 12% yield. Mr. Boutros would like to earn at least $2,880 this year. According to Value Line Magazine's safety index (1 highest to 5 lowest), Cal Computers

A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 5 percentage points with 99% confidence if(a) he uses a previous estimate of 22%? (b) he does not use any prior estimates?

Suicide Attempts ) Suppose that adult females have attempted a sample of 200 adult females is selected at random and finds that 11 of them have attempted suicide A) assuming 3% suicidal date, certify that this is a binomial experiment and identify the symbols: n,x and p. B) use normal approximation to find the probability that at least 11 among

The English department at Oaks College has the faculty to offer 11 sections in any combination of these four courses: Fiction Writing, Poetry, Short Story, and Great Books. The number of sections apportioned to each course is to be based on enrollments in the courses as shown: Course Fiction Writing Poetry Short Story Great Books Enrollment 56 35

QUESTION 9 Based on the following screenshot for a 95 confidence interval, calculate the margin of error. Round to four decimal places. NORMRL FLORT RUTO RERL CL IPropZ1nt (0.51247 , o. 70858) . 6105263158 n95 3 points Save Answer

Propose a 2 x 3 factorial design to study the effects of exposure to popular culture on different social media on different groups. State a specific popular culture to focus on. Propose a specific topic with clear variables to measure. Answer the following: a) State the purpose and objectives of the study. b) Upon identifying the specific

Consider these sample data Xl 14, 6, 4, 19. a. Find n. b. Compute c. Determine x.

Null Hypothesis: Regression coefficient of ticket price = 0 Alternative Hypothesis: Regression coefficient of ticket price 0 Coefficient of Determination = 38% Based on the data provided and your understanding, is the hypothesis true? (And why?)

Take Quiz 2.1 Question 16 1 pts Given a binomial probability experiment is conducted with the given parameters. Compute the probability of x successes in the n independent trials of the experiment. n = 12, p = 0.35, P(X=6)= Round the result to three decimal places. Question 17 able

Schedule the following six jobs through two machines in sequence to minimize the flow time.What is the flow time and idle time for your schedule? Processing Time Job Machine 1 Machine 2 A 5 2 B 16 15 C 1 9 D 13 11 E 17 3 F 18 7

A coffee shop owners thinks that 25% of his customers order tea, 25% of his customers order hot chocolate and the remaining 50% of his customers order coffee. A recent sample of 100 customers found that 25 ordered tea, 15 ordered hot chocolate and 60 ordered coffee. Using the 5% significance level, what is the critical value and will you reject

Let's assume that the distribution of lengths for a strut manufactured for a critical joint on the space shuttle has a normal distribution with a mean of 4.230 cm and a standard deviation of 0.001 cm. If the struts are meticulously inspected and quality tested, and a bolt must be between 4.2296 and 4.2304 cm to function correctly within the

Use the model to make the appropriate prediction. A sociologist wanted to determine whether there was a relation between a state's poverty rate (x) and its teen pregnancy rate (y). Data from all 50 states produced the regression model: y=4.3+1.4(x) What does the model suggest for the teen pregnancy rate of Florida, which has a poverty rate of 16.6?

The university is interested in the proportion of students that take summer courses. A survey found that 20% of students take summer courses. Assume this percentage is true for the population of university students. Let be the proportion in a random sample of 100 students.What is the standard error?

(a) At what psi will the TPMS trigger a warning for this car? (Round your answer to 2 decimal place.)

Probability 9. please show calculations 9. For an F distribution, find the following values and draw the corresponding graph: (3)1710: for v1=4 and v2 = 9 (b) ms for V1= 5 and v2 = 3 (C) P (17': 6.16) with m =6 and V2=4

The reported Cpk for a process with an average of 104 units, a standard Deviation of 3 units and upper and lower specification limits of 122 and 96 units would be? A. 0.5 B. 0.89 C. 1.00 D. 2.00

Let A denote the event of placing a $1 straight bet on the California daily 4 lottery and winning. There are 10,000 different ways that you can select four digits (with repetition allowed) in this lottery, and only one of those four-digit numbers will be the winner. What is the value of P(A)? What is the value of P()

Find the standard deviation of the data summarized in the given frequency table. The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The frequency table below summarizes the results. Find the standard deviation. Round your answer to one decimal place. Waiting Time Number of

(a) Find the area above 29 for a N(15, 5) distribution. Round your answer to three decimal places. Area = 1 .003 (b) Find the area below 11 for a N(15, 5) distribution. Round your answer to three decimal places. Area =

If X~ N(50,4), the practical range of X values is x E R True False In a normal distribution all outcomes are equally likely. True False The probability that x > 4 in this distribution is 75%. 1 2 3 4 5 x True O False

Please provide answers in interval notation. 1. Let S = (x| - 5

Let A B and where x denotes a real number. Find A nB,A n n C, and n C)

Question 2 (1 point) If the probability that person A will be alive in 25 years is 0.4 and the probability that person B will be alive in 25 years is 0.6, what is the probability that they will both be alive in 25 years? Paragraph BIUAE Ev +

For each of the following, CIRCLE or FILL-IN the correct response. a. For confidence interval estimates, the best prediction would be i. A wide interval with high confidence ii. A narrow interval with low confidence iii. A narrow interval with high confidence

Ages Number of students 15-18 5 19-22 6 23-26 27-30 31-34 35-38 Find the relative frequency for the class with lower class limit 31 Relative Frequency = Give your answer as a percent, rounded to two decimal places

Suppose the plot below shows the distribution for the number of grandchildren members at a reThe label on a water bottle indicates the volume is 500 milliliters. A consumer claims that a particular brand consistently under fills their bottles. The table below shows volumes of a random sample of bottles from the brand in question. At the 5% level

Construct a set of four numbers that have mean 10, mode 8, and median 9. Explain your answer.

HW Score: 24.56%, 4.67 of 19 Homework: G G . 4 Homework 0 raded Week points Points: 0 of 1 Find the indicated 2 score. The graph depicts the standard normal distribution with mean 0 and standard deviation 1. 0.1735 2 0 The indicated 2 score is E]. (Round to two decimal pieces as needed.)

HW Score: 24.56? . 4.67 of 19 Homework: Go - Graded Week Question 9, 6.1 .16-T > points 4 Homework 0 Points: 0 of1 Find the indicated 2 score. The graph depicts the standard normal distribution with mean 0 and standard deviation 1. I 0.1814 The indicated 2 score is D (Round to two decimal piaces as needed.)

There are validity issues attached to each type of mixed methods design. An Exploratory Sequential Design (ESD) is a useful research method that might be used to investigate the significance of a diverse teaching workforce in light of the fact that there is a gap between the racial composition of American students and the racial composition of the

A college foundation raises funds by selling raffle tickets for a new car worth $36,000. If 600 tickets are sold for $120 each, find the expected net winnings of a person who buys two tickets.

What are the properties present in the graph of a normal distribution. What is a example of a real-world scenario in which a normal distribution is applicable

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the population proportion. You would like to be 98% confident that your estimate is within 0.2% of the true population proportion. How large of a sample size is required?

Suppose an experiment has the outcome 1,2,3....., 12where each outcome has an equal of occuring.Let event A={1,2,3,4,5,6} and event B={6,7,8,9}.Then Or(P u B)

When would Cp equal Cpk in a capability index calculation? a. When the standard deviation is low b. When the specification limits are wide c. When C P = PP d. When the process is perfectly centered

May you please explain me step by step? What is the probability that the sample average of this sample ( ) is more than 60? Given, population mean = 56.06 Standard deviation of population(s) = 15.889978 Population size = 1000

3 datasets with a minimum of 100 rows and a minimum of 3 columns. please do not include dataset from worldbank or GDP

After many studies, a researcher finds that the probability that a word recognition program correctly interprets a hand written word is 9/10. How many words out of 40 would the researcher expect the program to correctly interpret?

Consider the following data 4,3,7,6,2,8 Determine the median of the given data

2. The following data is a list of quiz scores from a recent Stats quiz: 30, 27, 28, 20, 29, 22, 20, 23, 29, 27, 6, 29, 27, 23, 20, 15, 27, 17 a. What is the most appropriate measure of center/spread for this data? b. What score would you need to receive a grade of B given your choice in part a? c. Are there any outliers in this data? Give your

A biologist collected data on a sample of 20 porcupines. She wants to be able to predict the body mass of a porcupine (M, in grams) based on the length of the porcupine (L, in cm). Her least squares regression equation is M=3089+175.6L. If it would make sense, provide a clear interpretation of the intercept of the regression line, in context.

The hourly pay of a sample of nurses is approximately normal with a mean of $37.25 and a standard deviation of $2.75. Approximately what percent of the nurses make: a. More than $42.75? % b. Less than $45.50? % c. Between $40.00 and $42.75? %

Discuss and explain the idea behind hypothesis testing. Describe the process performed in order to get the results, the key assumptions in this process, and the appropriateness of these assumptions to the question; Interpret the result by explaining the meaning of the pvalue.

Length of Confidence Interval and Appropriate Sample Size

4. Confidence level 93 D 0.18 5. Confidence level 90 p 0.35 E 0.451 E 0.284

How would I use a significance test for means to figure wether stricter covid 19 laws help reduce population deaths? Federal Cases/ 100,000 Deaths/ 100,000 State population population More lenient Baden-Wurttemberg 10,637 122 aws Stricter laws Bavaria 11,644 154

A population of values has a normal distribution with =178.4=178.4 and =54.9=54.9. You intend to draw a random sample of size n=225n=225. Find the probability that a single randomly selected value is greater than 178.8. P ( X > 178.8) = Find the probability that a sample of size n=225n=225 is randomly selected with a mean greater than 178.8. P ( M

Chapter 4.3 Homework Score: 0/15 0/15 answered ents Question 14 What is the complement of P(A) if P(A) = 0.84 P (A ) Question Help: Message instructor Submit Question 5 tual Tutoring

8;4 1. [-/0.45 Points]DETAILSBBUNDERSTAT12 8.4.003. MY NOTES ASK YOUR TEACHER When testing the difference of means for paired data, what is the null hypothesis? H o : d < 0 H o : d > 0 H o : d = 0 H o : d 0 2. [-/0.45 Points]DETAILSBBUNDERSTAT12 8.4.009.MI.S. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER In this problem, assume that the distribution

We have the following stochastic process X(t)=Acos(wot+), in which A and wo are real constants and the phase [0, /2]. Determine if the Stochastic Process is ergodic, its mean power and the power spectral density

calcular lo siguiente: 78, 75, 79, 80, 74, 81, 75, 76, 80, 90, 75, 74, 76, 73, 80, 82, 79, 78 Media Moda Mediana Rango Cuartiles Rango Intercuartiles Varianza Desviacin Estndar Coeficiente de Variacin

A traffic safety report indicated that for the 21-24 year age group, 31.58% of traffic fatalities were victims who had used a seat belt. Victims who were not wearing a seat belt accounted for 59.83% of the deaths, and the status of the rest was unknown. A study of 120 traffic fatalities in a particular region showed that for this age group, 35 of

The contingency table below shows some categories of data along with frequency counts. Respond to the prompts that follow. Flavor Number of Pieces Expected Number of (10 bags) Pieces Apple 185 200 Lime 215 200 Cherry 175 200 Mango 225 200 Grape 200 200

Mikasa is a branch manager and decided to work on the time that any customer wait to get their work done at banks. Mikasa collected the following results: 9, 11, 3, 6, 8, 20, 12, 25, 4, 6, 7, 4, 10, 12, 14, 16, 21, 21, 25, 30, 22, 10, 7, 8, 5. a) Construct a frequency table (include cumulative frequency) for Mikasa's data. b) Construct a histogram

Find the area under the standard normal curve between z = -2.38 and z = 1.4, P (-2.38 < z < 1.4). (Give your answer correct to four decimal places.) b) Find the area to the right of z =1.41. (c) Find the area to the right of z =-1.78. (d) Find the area to the left of z =1.25. (e) Find the area to the left of z =-1.25.

You roll a six-sided die. Find the probability of each of the following scenarios. (a) Rolling a 5 or a number greater than 3 (b) Rolling a number less than 5 or an even number (c) Rolling a 2 or an odd number (a) P(5 or number > 3) = (Round to three decimal places as needed.)

The management of Lanzilotta Corporation is considering a project that would require an investment of $263, 000 and would last for 8 years. The annual net operating income from the project would be $66,000, which includes depreciation of $31,000. The scrap value of the project's assets at the end of the project would be $15,000. The cash inflows

Carefully outline all the aspects that you would execute in order to conduct a national household survey of a representative sample of household on living conditions or standards

If two group means are in the same homogeneous group, they are unlikely to be significantly different. True False

question 1 A somewhat outdated study indicates that the mean number of hours worked per week by software developers is $4. We have good reason to suspect that the mean number of hours worked per week by software developers, p. is now different from 44 and wish to do a statistical test. We select a random sample of software developers and find that

What is simple random sampling an example What is Stratified Random Sampling and an Example What is probability sampling an example What is non-random sampling and an example

Homework: Go - Graded Week 4 Homework

Homework Go Graded Week 4 Homework Find the indicated critical value. zo.01 Click to view page 1 of the table. Click to view page 2 of the table. (Round to two decimal places as needed.) Question 12, 6.1.43 HW Scor points O Point

after standardizing the scores to this new distribution, what would a raw score of 28 become

ffter standardizing the scores to this new distribution, what would a raw score of 28 become

Find the area of the shaded region. The graph depicts the standard normal distribution of bone density scores with mean 0 and standard deviation 1. O z- -0.97 The area of the shaded region is | (Round to four decimal places as needed.)

Question 7 2 Points Which of the following describes the squared average distances from the mean? A Variance B Mode Median D Mean E Standard Deviation

A 4 kg bird flies horizontally 6 m above the ground at 8 m/s . Calculate its total energy (kinetic plus potential)

The joint pdf of X, Y is given by c(xty) 0

The joint pdf of X, Y is given by fx,Y (x, Y) 0 (a) Find c. (b) Let Z min X, W. Find fz (z), the pdf of Z. 0 s x,yS.1 else

822 LISTING PR SIZE (SQUARE FT) 249,000 435,000 440,000 199,999 420,000 419,900 389,000 49,999 399,900 24,900 480,000 429,900 469,900 352,000 699,000 310,000 249,000 279,900 389,900 300,000 1, 994sqft 1,700sqft 1,080sqft 470sq ft 19,998sqft 4,251sqft 7,841sqft 1,498sqft 1,518sqft 1,356sqft 1,763sqft 1,500sqft 1,492sqft 1, Illsqft 3,585sqft

Outcome 1 2 3 4 5 6 7 8 Frequency 12 45 2 46 55 20 4 16 The table above shows the frequency of outcomes for a certain set of experimental values. Which of the following graphs illustrates the cumulative relative frequency of the values? C. 0.3 0.25 0.05 M Open Calculator O A VOB x O C. O D

C. Find the lengtl standard deviatio 1. s 2.36, .s3 2 3 4 5 3.35,

What is the probability that the expected value of a fair coin will be between 1/3 and 9/20 after 100 throws ? (0,1 with probability 0.5 each)

Conduct a Mann-Whitney U test. Health status (PHSTAT_A) is the independent variable and BMI is the dependent variable. Compare people who stated that their health status was good to those whose reported health status was poor

Mathematics In The Modern World Subject

Cn (Problem Solving.) Solve the given problems and provide a detailed solution to your answer. (15 points each) (a) What day Of the Week is February 14. 1356 (b) The first I I digits of a UPC is 61433221176. Find the check digit. (c) The ISBN Ofthe book entitled Relativity The Special and General Theory by Albert Einstein is 9780 517 88441 Find

Use technology to find the P-value for the hypothesis test described below. The claim is that for a smartphone carrier's data speeds at airports, the mean is u = 17.00 Mbps. The sample size is n= 12 and the test statistic is t = 2.438. P-value = (Round to three decimal places as needed.)

Parameters of which binomial distribution listed below do not allow the use of normal approximation? O n=50 and p=0.4 On=40 and p=0.25 O n=45 and p=0.9 O n=40 and p=0.8 Other

Q 19 A regression was completed to predict Revenue . X variables were Advertising and Quarter (1, 2, 3, 4). What is the best interpretation of the regression results below StotistEs Multiple R R Sqm A NOVA Intercept Select one 0.02316 17541.48 27 22030.72 085.369 166260 stat 1258602 .439247 .067147 s. s 192.09 .59. upper 152198 95. .a.585gs 6gm.g

1. Plot the following using a bar plot. (1,5),(2,4), (3,5),(4,8), (5,8),(6,2) 2. Plot the following using an (x.y) plot. (-3,9),(-2,4), (-1,1),(0,0), (1,1), (2,4),(3,9)

For a normal distribution with a mean of 244 and a standard deviation of 38, what is the Z value for a random value to be 106? (Use 2 decimal digits)

Use technology to construct the confidence intervals for the population variance Q^2 and the population standard deviation Q. Assume the sample is taken from a normally distributed population. C=0.99 s^2 = 19.36 n=29 A)Find the confidence interval for the population variance B) Find confidence interval for the population standard deviation

In the entire group of first-year statistics students, half own a calculator (h), and the rest don't (d). Three students are randomly chosen from the group. What is the probability that at least two randomly chosen students do not own a calculator?

A math teacher gave her class two tests. 18% of the class passed both tests and 55% of the class passed the first test. What percentage of those who passed the first test also passed the second test? (round to two decimal places)

You have a bowl full of candy with lemon, strawberry, cherry, orange, and grape candies. You want to give 3 pieces of candy to your friend. How many possible combinations of flavors can be chosen? Repetition of flavors is allowed.

In a survey, 95% of n = 300 randomly sampled married men said that they would marry their spouses again if they had it to do all over again. In the same survey, 85% of n = 500 married women said that they would marry their spouses again. 1.) Calculate a 95% confidence interval that estimates the difference in proportions of married women and men