Concept explainers
Section 1:
To find: The mean of scores of four roommates.
Section 1:
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 find: The standard deviation of scores of four roommates.
Section 2:
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 find: The standard error of the mean.
Section 3:
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.
Whether it is correct to calculate the confidence interval for the data or not.
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
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Chapter 7 Solutions
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