Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfac 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 fo 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. Hoo² = 144 H₂:0² Ⓒ144 Calculate the value of the test statistic (to 2 decimals). p-value is With F
Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfac 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 fo 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. Hoo² = 144 H₂:0² Ⓒ144 Calculate the value of the test statistic (to 2 decimals). p-value is With F
MATLAB: An Introduction with Applications
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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 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.
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
144
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
ŷ](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc8514667-bf86-4079-a5fb-967fac7b38d7%2F328e506c-5c28-415f-b987-4cad7d3e1efa%2F04orkgk_processed.png&w=3840&q=75)
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 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.
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
144
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
ŷ
![Excel template Saved
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Chi Square Test Statistics
Lower-Tail p-value
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Transcribed Image Text:Excel template Saved
5
D2
123456789 DIN
File
10
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วา
។
Home
A
Satisfaction
Score
94
90
82
74
95
97
80
83
80
95
84
80
97
67
60
=
Insert
Data
Arial
X ✓ fx
B
+
Draw Page Layout
Part a
Mean
Part b
Variance
✓10
Part c
Standard Deviation
Part d
Degrees of Freedom
с
Calculation Mode: Automatic Workbook Statistics
B
Formulas
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")
Search (Option + Q)
Data
D
Review
12
0.05
View
V
E
ab
Formula
Help
Number
F
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
>
←0
.00
.00
→.0
▬▬▬▬
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V
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1
Σv
J
Editing
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