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Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of 12 is expected. Costco with its 432 warehouses in 40 states was the only chain store to earn an outstanding rating for overall quality. A sample of 15 Costco customer satisfaction scores is contained in the Excel Online file below. Construct a spreadsheet to answer the following questions. Open spreadsheet a. What is the sample mean customer satisfaction score for Costco (to 2 decimals)? b. What is the sample variance (to 2 decimals)? c. What is the sample standard deviation (to 2 decimals)? d. Construct a hypothesis test to determine whether the population standard deviation of 12 should be rejected for Costco. State the null and alternative hypotheses. H₂=144 H₁: 144 Calculate the value of the test statistic (to 2 decimals). p-value is With a .05 level of significance, what is your conclusion? The hypothesis that the population standard deviation is 12 [cannot be rejected

Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of 12 is expected. Costco with its 432 warehouses in 40 states was the only chain store to earn an outstanding rating for overall quality. A sample of 15 Costco customer satisfaction scores is contained in the Excel Online file below. Construct a spreadsheet to answer the following questions. Open spreadsheet a. What is the sample mean customer satisfaction score for Costco (to 2 decimals)? b. What is the sample variance (to 2 decimals)? c. What is the sample standard deviation (to 2 decimals)? d. Construct a hypothesis test to determine whether the population standard deviation of 12 should be rejected for Costco. State the null and alternative hypotheses. H₂=144 H₁: 144 Calculate the value of the test statistic (to 2 decimals). p-value is With a .05 level of significance, what is your conclusion? The hypothesis that the population standard deviation is 12 [cannot be rejected

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of o = 12 is expected. Costco with its 432 warehouses in 40 states was the only chain store to earn an outstanding rating for overall quality. A sample of 15 Costco customer satisfaction scores is contained in the Excel Online file below. Construct a spreadsheet to answer the following questions. X Open spreadsheet a. What is the sample mean customer satisfaction score for Costco (to 2 decimals)? b. What is the sample variance (to 2 decimals)? c. What is the sample standard deviation (to 2 decimals)? d. Construct a hypothesis test to determine whether the population standard deviation of o= 12 should be rejected for Costco. State the null and alternative hypotheses. Ho: o² = 144 H₂:0² v Calculate the value of the test statistic (to 2 decimals). 144 p-value is With a .05 level of significance, what is your conclusion? The hypothesis that the population standard deviation is 12 [cannot be rejected ✔✔
Transcribed Image Text:Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of o = 12 is expected. Costco with its 432 warehouses in 40 states was the only chain store to earn an outstanding rating for overall quality. A sample of 15 Costco customer satisfaction scores is contained in the Excel Online file below. Construct a spreadsheet to answer the following questions. X Open spreadsheet a. What is the sample mean customer satisfaction score for Costco (to 2 decimals)? b. What is the sample variance (to 2 decimals)? c. What is the sample standard deviation (to 2 decimals)? d. Construct a hypothesis test to determine whether the population standard deviation of o= 12 should be rejected for Costco. State the null and alternative hypotheses. Ho: o² = 144 H₂:0² v Calculate the value of the test statistic (to 2 decimals). 144 p-value is With a .05 level of significance, what is your conclusion? The hypothesis that the population standard deviation is 12 [cannot be rejected ✔✔
L23456NHAGEN 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 A Satisfaction Score 93 90 85 77 95 98 80 83 80 93 89 80 97 67 66 B Part a Mean Part b Variance Part c Standard Deviation Part d Degrees of Freedom с Hypothesized Standard Deviation Chi Square Test Statistics Lower-Tail p-value Upper-Tail p-value Two-Tail p-value Significance Level (alpha) Can the hypothesis that the population standard deviation is 12 be rejected? (Enter "Can be rejected" or "Cannot be rejected") D 12 0.05 E Formula F #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A
Transcribed Image Text:L23456NHAGEN 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 A Satisfaction Score 93 90 85 77 95 98 80 83 80 93 89 80 97 67 66 B Part a Mean Part b Variance Part c Standard Deviation Part d Degrees of Freedom с Hypothesized Standard Deviation Chi Square Test Statistics Lower-Tail p-value Upper-Tail p-value Two-Tail p-value Significance Level (alpha) Can the hypothesis that the population standard deviation is 12 be rejected? (Enter "Can be rejected" or "Cannot be rejected") D 12 0.05 E Formula F #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A
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