Introduction to the Practice of Statistics
9th Edition
ISBN: 9781319013387
Author: David S. Moore, George P. McCabe, Bruce A. Craig
Publisher: W. H. Freeman
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Chapter 7, Problem 119E
Section 1:
To determine
To find: The
Section 1:
Expert Solution
Answer to Problem 119E
Solution: The required mean of the data is 153.50.
Explanation of Solution
Calculation: To obtain the mean, follow the steps below in Minitab software.
Step 1: Enter the data in the Minitab worksheet.
Step 2: Go to Stat and select the basic statistics, and then click on display the
Step 3: Enter the variable in the variables column.
Step 4: Choose the options as mean.
Step 5: Click on OK two times.
The mean is obtained as 153.50.
Section 2:
To determine
To find: The standard deviation of scores of four roommates.
Section 2:
Expert Solution
Answer to Problem 119E
Solution: The standard deviation of the data is 14.71.
Explanation of Solution
Calculation: To obtain the standard deviation, follow the steps below in Minitab software.
Step 1: Enter the data in the Minitab worksheet.
Step 2: Go to Stat and select the basic statistics, and then click on display the descriptive statistics.
Step 3: Enter the variable in the variables column.
Step 4: Choose the options as mean.
Step 5: Click OK twice.
The standard deviation is obtained as 14.71.
Section 3:
To determine
To find: The standard error of the mean.
Section 3:
Expert Solution
Answer to Problem 119E
Solution: The standard error is 7.35.
Explanation of Solution
Calculation: To obtain the standard error, follow the steps below in Minitab software.
Step 1: Enter the data in the Minitab worksheet.
Step 2: Go to Stat and select the basic statistics, and then click on display the descriptive statistics.
Step 3: Enter the variable in the variables column.
Step 4: Choose the options as mean.
Step 5: Click OK twice.
The standard error is obtained as 7.35.
To determine
Whether it is correct to calculate the confidence interval for the data or not.
Expert Solution
Answer to Problem 119E
Solution: As the data cannot be considered as simple random sampling, the confidence interval should not be calculated for this data.
Explanation of Solution
To compute the confidence interval for any dataset, the data should belong to simple random sampling. In the provided case, the data cannot be considered as simple random sampling because of the small sample size . Therefore, it is not appropriate if the confidence interval is calculated on the basis of the provided data.
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Students have asked these similar questions
PEER REPLY 1:
Choose a classmate's Main Post.
1. Indicate a range of values for the independent variable (x) that is reasonable
based on the data provided.
2. Explain what the predicted range of dependent values should be based on
the range of independent values.
In a company with 80 employees, 60 earn $10.00 per hour and 20 earn $13.00 per
hour.
Is this average hourly wage considered representative?
The following is a list of questions answered correctly on an exam. Calculate the
Measures of Central Tendency from the ungrouped data list.
NUMBER OF QUESTIONS ANSWERED CORRECTLY ON AN APTITUDE EXAM
112
72
69
97
107
73
92
76
86
73
126
128
118
127
124
82
104
132
134
83
92
108
96
100
92
115
76
91
102
81
95
141
81
80
106
84
119
113
98
75
68
98
115
106
95
100
85
94
106
119
Chapter 7 Solutions
Introduction to the Practice of Statistics
Ch. 7.1 - Prob. 1UYKCh. 7.1 - Prob. 2UYKCh. 7.1 - Prob. 3UYKCh. 7.1 - Prob. 4UYKCh. 7.1 - Prob. 5UYKCh. 7.1 - Prob. 6UYKCh. 7.1 - Prob. 7UYKCh. 7.1 - Prob. 8UYKCh. 7.1 - Prob. 9UYKCh. 7.1 - Prob. 10UYK
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