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answer for letter d and e

answer for letter d and e

MATLAB: An Introduction with Applications
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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answer for letter d and e

 

Will improving customer service result in higher stock prices for the companies providing the better service? "When a company's satisfaction score has improved over the prior year's results and is above the national average (75.7), studies show its shares have a good chance of outperforming the broad stock market in the long run." The following satisfaction scores of three companies for the fourth quarters of two previous years were obtained from the American Customer Satisfaction Index. Assume that the scores are based on a poll of 63 customers from each company. Because the polling has been done for several years, the standard deviation can be assumed to equal 8 points in each case. ETT Company Year 1 Score Year 2 Score Rite Aid 76 78 Expedia 72 76 J.C. Penney 77 82 a. For Rite Aid, is the increase in the satisfaction score from Year 1 to Year 2 statistically significant? Use a 0.05 and null hypothesis is Ho : H1-H2 <0. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? The difference - Select your answer vstatistically significant. b. Can you conclude that the Year 2 score for Rite Aid is above the national average of 75.7? Use a = 0.05 and test the null hypothesis Ho : p< 75.7. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? We Select your answer - vthat customer service has improved for Rite Aid. c. For Expedia, is the increase from Year 1 to Year 2 statistically significant? Use a = 0.05 and test the null hypothesis Ho H1- Ha S0. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? The difference Select your answer - vstatistically significant. d. When conducting a hypothesis test with the values given for the standard deviation, sample size, and a, how large must the increase from Year 1 to Year 2 be for it to be statistically significant? (to 2 decimals) e. Use the result of part (d) to state whether the increase for J.C. Penney from year 1 to year 2 is statistically significant. a Pret vith CamScanner The in reas ct yr .W. stotist ca ly sic nifica
Transcribed Image Text:Will improving customer service result in higher stock prices for the companies providing the better service? "When a company's satisfaction score has improved over the prior year's results and is above the national average (75.7), studies show its shares have a good chance of outperforming the broad stock market in the long run." The following satisfaction scores of three companies for the fourth quarters of two previous years were obtained from the American Customer Satisfaction Index. Assume that the scores are based on a poll of 63 customers from each company. Because the polling has been done for several years, the standard deviation can be assumed to equal 8 points in each case. ETT Company Year 1 Score Year 2 Score Rite Aid 76 78 Expedia 72 76 J.C. Penney 77 82 a. For Rite Aid, is the increase in the satisfaction score from Year 1 to Year 2 statistically significant? Use a 0.05 and null hypothesis is Ho : H1-H2 <0. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? The difference - Select your answer vstatistically significant. b. Can you conclude that the Year 2 score for Rite Aid is above the national average of 75.7? Use a = 0.05 and test the null hypothesis Ho : p< 75.7. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? We Select your answer - vthat customer service has improved for Rite Aid. c. For Expedia, is the increase from Year 1 to Year 2 statistically significant? Use a = 0.05 and test the null hypothesis Ho H1- Ha S0. Find the test statistic and p-value. Use Table 1 of Appendix B. z value (to 2 decimals) p-value (to 4 decimals) What can you conclude? The difference Select your answer - vstatistically significant. d. When conducting a hypothesis test with the values given for the standard deviation, sample size, and a, how large must the increase from Year 1 to Year 2 be for it to be statistically significant? (to 2 decimals) e. Use the result of part (d) to state whether the increase for J.C. Penney from year 1 to year 2 is statistically significant. a Pret vith CamScanner The in reas ct yr .W. stotist ca ly sic nifica
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