Open spreadsheet a. What is the sample mean customer satisfaction score for Costco (to 2 decimals)? H b. What is the sample variance (to 2 decimals)? H c. What is the sample standard deviation (to 2 decimals)? H d. Construct a hypothesis test to determine whether the population standard deviation of 0' = 12 should be rejected for Costco. State the null and alternative hypotheses. He:oz=144 H :02-144 Calculate the value of the test statistic (to 2 decimals). H pvalue is \\:|. With a .05 level of significance, what is your conclusion? The hypothesis that the population standard deviation is 12 . D2 v fx A B C D m F Satisfaction Score Part a Formula 2 96 Mean #N/A 90 84 Part b 77 Variance #N/A 6 95 7 98 Part c 8 80 Standard Deviation #N/A 9 81 10 82 Part d 11 90 Degrees of Freedom #N/A 12 84 13 80 Hypothesized Standard Deviation 12 14 94 15 68 Chi Square Test Statistics #N/A 16 61 17 Lower-Tail p-value #N/A 18 Upper-Tail p-value #N/A 19 Two-Tail p-value #N/A 20 21 Significance Level (alpha) 0.05 22 Can the hypothesis that the population standard deviation is 12 be rejected? (Enter 23 "Can be rejected" or "Cannot be rejected") #N/A 24 25