(i) Determine if the hypothesis test is one-tailed or two-tailed.(ii) Find the critical value. Round the answer to at least two decimal places.(iii) Compute the test value. Round the standard deviations and F-score values to at least two decimal places.(iv) Make the decision and summarize the results. Ages of Dogs The average age of pet dogs is 4.3 years. Two random samples of pet owners who own dogs are selected. Sample 1 of 16dog owners was selected from owners who live in Miami. The standard deviation of the ages of the dogs in this sample is 1.0 years.Sample 2 of 8 dog owners was selected from dog owners who live in Boston. The standard deviation of these dogs was 0.6 year. Atα = 0.01, can it be concluded that there is a difference in the variances? Use the critical value method and tables.olo

i) State the hypotheses. Null hypothesis: Alternative hypothesis:

(i) Determine if the hypothesis test is one-tailed or two-tailed. (ii) Find the critical value. Round the answer to at least two decimal places. (iii) Compute the test value. Round the standard deviations and F-score values to at least two decimal places. (iv) Make the decision and summarize the results.

(i) Determine if the hypothesis test is one-tailed or two-tailed. (ii) Find the critical value. Round the answer to at least two decimal places. (iii) Compute the test value. Round the standard deviations and F-score values to at least two decimal places. (iv) Make the decision and summarize the results.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 239.7-cm and a standard deviation of 0.8-cm. For shipment, 5 steel rods are bundled together.Find P58, which is the average length separating the smallest 58% bundles from the largest 42% bundles. P58 = -cmEnter your answer as a number accurate to 2 decimal place. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.
#3 Use the given confidence interval to find the margin of error and the sample proportion. (0.629,0.659) E= (Type an integer or a decimal.) p%3(Type an integer or a decimal.) Type here to search ■ 直 0 F4 F5 F7 2 4.
We consider the differences between the reading and writing scores of a random sample of 200 students who took the High School and Beyond Survey. The mean and standard deviation of the differences are Xread = -0.531 and 8.858 points. write (a) Calculate a 95% confidence interval for the average difference between the reading and writing scores of all students. (Round your answers to two decimal places.) (b) Interpret this interval in context. (Round your answers to two decimal places.) We are 95% confident that on the reading test students score, on average, points lower to You may need to use the appropriate table in the Appendix of Tables to answer this question. points higher than they do on the writing test. (c) Does the confidence interval provide convincing evidence that there is a real difference in the average scores? Explain. Since 0 is included in the interval, the confidence interval does not provide convincing evidence that there is a real difference in the average scores.
Congratulations, you just made a confidence interval! But wait, how did we decide on the width of the interval? The middle of the interval is the sample mean. We start there, and then the "wiggle room" we give on either side of that center is called the margin of error (MOE). There's a formula for margin of error: 0 MOE = 2* √T This formula consists of three values: o is the standard deviation, n is the sample size, and z is a multiplier that we choose based on the confidence level we need. Confidence levels are expressed as percentages, the most common are 90%, 95%, and 99%: * Confidence Z Level value 90% 1.645 95% 1.96 99% 2.576 Let's practice computing a margin of error. For our earlier example about houses, suppose the standard deviation was 14 years, and the sample size was 30. Use a confidence level of 95% and determine the margin of error: σ Remember, we'll use the formula MOE = 2* . First fill in the numbers for each part of the formula: √n = σ= n = Now put it all together,…
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Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 90, with a sample size of (i) 400 and (ii) 1521. What is the effect of the sample size? Question content area bottom Part 1 (i) Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 90 with a sample size of 400.
Debra attends a fashion institute that has no on-campus housing. The mean distance commuted to campus among all students at the fashion institute is 16 kilometers with a standard deviation of 6 kilometers. The distance Debra commutes is 29 kilometers. (a) Find the z-score of Debra's commute distance relative to the commute distances amongll the students at the institute. Round your answer to two decimal places. (b) Fill in the blanks to interpret the z-score of Debra's commute distance. Make sure to express your answer in terms of a positive number of standard deviations. Debra's commute distance is standard deviations (Choose one) v the mean commute distance among all students at the institute. Submi Continue MacBook Air
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In an inter-school competition, there are a total of 14 participants. Each participant answered 20 multiple choice questions. Below are the numbers of correct answers obtained by the participants: 16, 11, 20, 19, 18, 17, 15, 16, 17, 19, 20, 17, 13, 13 (a) Find the mean, 90 th percentile, interquartile range, and standard deviation of the number of correct answers obtained by a participant. (b) Each participant has a basic score of 100 points. For each correct answer, 20 points would be given; for each wrong answer, 10 points would be deducted. Use X to represent the number of correct answers and Y to represent the final points of the participant, express Y as a linear function of X. (c) Find the following summary statistics of the final points a participant gets in this competition: Mean, standard deviation, interquartile range, maximum. (d) Write a simple summary report (in around 30 – 50 words) about the final points of a participant gets in this inter-school competition. (The…