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 a = 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 a = 12 should be rejected for Costco. State the null and alternative hypotheses. Ho: o² = 144 H₂:0² Ⓒ144 Calculate the value of the test statistic (to 2 decimals). p-value is With a .05 level of significance, what is your conclusion?
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 a = 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 a = 12 should be rejected for Costco. State the null and alternative hypotheses. Ho: o² = 144 H₂:0² Ⓒ144 Calculate the value of the test statistic (to 2 decimals). p-value is With a .05 level of significance, what is your conclusion?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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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 a = 12 should be rejected for Costco.
State the null and alternative hypotheses.
Ho: 0²
H₂ : 0²
Calculate the value of the test statistic (to 2 decimals).
= 144
144
p-value is
With a .05 level of significance, what is your conclusion?
(
Transcribed Image Text:D2
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