(a)
To calculate: The critical value
(a)
Answer to Problem 58E
The critical value is 1.796.
Explanation of Solution
Given information:
Confidence level
Population mean
Formula used:
Degree of freedom
Find the degree of freedom, use the formula
Confidence level is 90%.
Convert 90% into decimal.
Find the column.
Find the critical value
Hence, the critical value is 1.796.
(b)
To calculate: The critical value
(b)
Answer to Problem 58E
The critical value is 2.045.
Explanation of Solution
Given information:
Confidence level
Population mean
Formula used:
Degree of freedom
Calculation:
Find the degree of freedom, use the formula
Degree of freedom
Confidence level is 95%.
Convert 95% into decimal.
Find the column.
Find the critical value
Hence, the critical value is 2.045.
Chapter 8 Solutions
The Practice of Statistics for AP - 4th Edition
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