Randomly selected 120 student cars have ages with a mean of 7.1 years and a standard deviation of 3.6 years, while randomly selected 45 faculty cars have ages with amean of 5.6 years and a standard deviation of 3.3 years.1. Use a 0.03 significance level to test the claim that student cars are older than faculty cars.The test statistic isIs there sufficient evidence to support the claim that student cars are older than faculty cars?OA. NoB. Yes2. Construct a 97% confidence interval estimate of the difference 1-2, where 1 is the mean age of student cars and 2 is the mean age of faculty cars.< (μ41-4₂) <

Let x1 denote the sample of student cars and x2 be the sample of faculty cars.The sample size for x1…

Answered: Randomly selected 120 student cars have…

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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9.24 You are the manager of a restaurant for a fast-food franchise. Last month, the mean waiting time at the drive-through window for branches in your geographic region, as measured from the time a customer places an order until the time the customer receives the order, was 3.7 minutes. You select a random sample of 64 orders. The sample mean waiting time is 3.57 minutes, with a sample standard deviation of 0.8 minute. a. At the 0.05 level of significance, is there evidence that the population mean waiting time is different from 3.7 minutes? b. Because the sample size is 64, do you need to be concerned about the shape of the population distribution when conducting the t test in (a)? Explain.
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The management of KSmall Industries is considering a new method of assembling a computer. The current assembling method requires a mean time of 86 minutes with a standard deviation of 7.4 minutes. Using the new method, the mean assembly time for a random sample of 24 computers was 71 minutes. Required: a. Using the 0.10 level of significance, can we conclude that the assembly time using the new method is faster? Reject Ho The mean assembly time is b. What is the probability of a Type Il error? Note: Round "Critical values" to 2 decimal places and round your final answer to 4 decimal places. Probability of Type II error less than 86 minutes. 0.0000
A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 60 months and a standard deviation of 11 months. Using the empirical rule (as presented in the book), what is the approximate percentage of cars that remain in service between 27 and 38 months?ans = ____ %
A college entrance exam company determined that a score of 23 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 200 students who completed this core set of courses results in a mean math score of 23.8 on the college entrance exam with a standard deviation of 3.6. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 23 on the math portion of the exam? Complete parts a) through d) below. Click the icon to view the table of critical t-values. a) State the appropriate null and alternative hypotheses. Fill in the correct answers below. The appropriate null and alternative hypotheses are Ho: versus H,:
Suppose that the average number of miles that a car is driven in the first three years is 41,500. To determine whether leased cars are driven more than “average”, 25 leased cars were sampled and the average Number of miles on the leased cars was 43,780 with a standard deviation of 10,520. To determine whether the average number of miles on leased cars is statistically significantly greater than the number of miles on other cars, what is the null and alternative hypothesis?
A college entrance exam company determined that a score of 21 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 200 students who completed this core set of courses results in a mean math score of 21.7 on the college entrance exam with a standard deviation of 3.4. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 21 on the mathematics portion of the exam? Complete parts a) through d) below. Click the icon to view the table of critical t-values. ... The/studentsyere randony ampled. eampleata ne froaopu lato that is approximately normal. le students test sc es were hdependetbhe another. F. None of he requirements are satişfied. ((c) Yse the P-value approach at the a = 0.10 level of significance to test…
For a 4-units class (ike Statistics, students should spend average of 12 hours studying for the class.A survey was done on 26 students, and the distribution of total study hours per week is bell-shaped with a nmean of 12 hours and a standard deviation of 2.9 hours. Use the Empirical Rule to answer the following questions. a) 68% of the students spend between hours and hours on Statistics each week. b) 95% of the students spend between hours and hours on Statistics each week. c) 99.7% of the students spend between hours and hours on Statistics each week. Check Answer
Nationally, patients who go to the emergency room wait an average of 7 hours to be admitted into the hospital. Do patients at rural hospitals have a different waiting time? The 12 randomly selected patients who went to the emergency room at rural hospitals waited an average of 5.8 hours to be admitted into the hospital. The standard deviation for these 12 patients was 1.8 hours. What can be concluded at the a = 0.10 level of significance level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Ho: ? Select an answer ✓ H₁: ?v Select an answer ✓ c. The test statistic ? ✓ (please show your answer to 3 decimal places.) (Please show your answer to 4 decimal places.) d. The p-value = e. The p-value is ? a f. Based on this, we should Select an answer the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest that the population mean awaiting time to be admitted into the hospital from the emergency room for…
A college entrance exam company determined that a score of 21 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 250 students who completed this core set of courses results in a mean math score of 21.2 on the college entrance exam with a standard deviation of 3.3. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 21 on the math portion of the exam? Complete parts a) through d) below. iueiuiy uie LUSI SiauSuc. to = 0.96 (Round to two decimal places as needed.) Identify the P-value, P-value = (Round to three decimal places as needed.)
Joe wondered what the average age of a Netflix Outer Banks viewer is, so he conducted an SRS of 12 subscribers about their age in years and found that the sample mean is 20.2 years old with a standard deviation of 2.2 years, What is a one-sided standardized test statistic for a sample with a=0.01 if Ho: H=19. O 1.991 O 2.132 O 1.890 O 2.001

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