We conduct a study to assess if there is the same variation in grades between engineering students andpsychology students, who are all graded on a scale of grades between 0 and 100. We sample 15 psychologystudents that have a standard deviation of 36 points in their grades. 15 engineering students are also sampled andhave a standard deviation of 19 points in their grade. We want to know if the population variations are different atthe 1% significance level. Determine the hypothesis then run the test using a critical value approach. Do not forgetto interpret your results.

Answered: Image /qna-images/answer/56f22a2a-d57a-4a4d-9d24-6b76f13b6fb8.jpg

Answered: We conduct a study to assess if there…

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 researcher wants to compare the effectiveness of two different study techniques for a test. The mean test score for the first technique is 75 with a standard deviation of 5, and the mean test score for the second technique is 80 with a standard deviation of 4. The sample size for each group is 20. What is the 95% Confidence Interval for the difference in the mean test scores for the two techniques?
Researchers investigate how the presence of cell phones influence the quality of human interaction. Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room. Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment. What statistical test is appropriate?
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The Fair Isaac Corporation (FICO) credit score is used by banks and other lenders to determine whether someone is a good credit risk. Scores range from 300 to 850, with a score of 720 or more indicating that a person is a very good credit risk. An economist wants to determine whether the mean FICO score is more than the cutoff of 720. She finds that a random sample of 75 people had a mean FICO score of 725 with a standard deviation of 95. Can the economist conclude that the mean FICO score is greater than 720? Use the =α0.01 level of significance and the P-value method with the TI-84 Plus calculator. 1. Find the appropriate null and alternate hypotheses. 2.Find P-value 3.Determine whether to reject H0 ( reject or do not reject) 4. There (is/isnot) enough evidence to conclude that the mean FICO score is more than the cutoff of 720
Fuel efficiency of Prius: Fueleconomy.gov, the official US government source for fuel economy information, allows users to share gas mileage information on their vehicles. The histogram below shows the distribution of gas mileage in miles per gallon (MPG) from 14 users who drive a 2012 Toyota Prius. The sample mean is 53.3 MPG and the standard deviation is 5.2 MPG. Note that these data are user estimates and since the source data cannot be verified, the accuracy of these estimates are not guaranteed. (a) The EPA claims that a 2012 Prius gets 50 MPG (city and highway mileage combined). Do these data provide strong evidence against this estimate for drivers who participate on fueleconomy.gov? The test statistic is: __________________(please round to two decimal places)The p-value:___________________________ for this hypothesis test is: (please round to four decimal places)(c) Please comment on the primary thing that is wrong about the following statement: There is sufficient evidence…
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