You may need to use the appropriate appendix table or technology to answer this question. '.'.'ill improving customer service result in higher stock prices for the companies providing the better service? "When a compa nv's satisfaction score has improved over the prior year's results and is above the national average [7355'], 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 4th quarters of two previous years were obtained from an economic indicator. Assume that the scores are based on a poll of ?3 customers from each company. Because the polling has been done for several years, the standard deviation can be assumed to equal 6 poi nts in each case. Company Year 1 Year 2 Co'r'par'y A 73 i'6 CoT'par'y B ?4 i'? Co'r'par'y C 7'? 7'8 (a) For Company A, is the increase in the satisfaction score from year 1 to year 2 statistically significant? Use a = 0.05. (Let M = the satisfaction score for year 2 and p2 = the satisfaction score for year 1..) State the hypotheses. ::H::,'cl.u2>0 SCI v o Calculate the test statistic. {Round your answer to two decimal places.) 1.52 x Calculate the |D-value. [Round your answer to four decimal places.) p-value = .197 X What is your conclusion? C." Reject H.. There is insufficient evidence to conclude that the customer service has improved for Company A. C." Do not reject H... There is insufficient evidence to conclude that the customer service has improved for Company A. C." Do not reject H... There is sufficient evidence to conclude that the customer service has improved for Company A. Reject H.. There is sufficient evidence to conclude that the customer service has improved for Company A. [d] (a) For Company B. is the increase from year 1 to year 2 statistically significant? Use a = 0.05. (Leta1 = the satisfaction score for year 2 and it: = the satisfaction score for year 1..) State the hypotheses. D '2' Calculate the best statistic. {Round your answer to two decimal places.)- Calculate the p-value. [Round your answer to four decimal places.) What is your conclusion? '3: Reject H... There is sufiicient evidence to conclude that the customer service has improved for Company B. I:- Do not reject H... There is insufficient evidence to conclude that the customer service has improved for Company El. 1: Reject H5. There is insufficient evidence to conclude that the customer service has improved for Company El. '3' Do not reject H... There is sufficient evidence to conclude that the customer service has improved ior Company El. When conducting a hypothesis test with the values given for the standard deviation, sample size, and 9'. how large must the increase from year 1 to year 2 be for it to :e statistically significant? (Round your answer to two decimal places.) Use the result of part (d:- to state whether the increase For Company C from year 1. to year 2 is statistically significant. The increase from Year 1 to Year 2 for Company C is not V a' statistically signicant