Concept explainers
a.
To find: The critical value.
a.
Answer to Problem 61E
The critical value is 2.262
Explanation of Solution
Given:
Confidence level = 95%
Calculation:
Level of significance
The degree of freedom can be calculated as:
Using t -critical value table, the critical value at 5% level of significance can be calculated as:
Thus, the critical value is 2.62.
b.
To find: The critical value.
b.
Answer to Problem 61E
The critical value is 2.861.
Explanation of Solution
Given:
Confidence level = 99%
Sample size ( n ) = 20
Calculation:
Level of significance
Degree of freedom can be calculated as:
The critical value at 1% level of significance can be calculated as:
Thus, the critical value is 2.861.
c.
To find: The critical value.
c.
Answer to Problem 61E
The critical value is 1.671.
Explanation of Solution
Given:
Confidence level = 90%
Sample size ( n ) = 77
Calculation:
Level of significance
Degree of freedom can be calculated as:
The critical value at 10% level of significance can be calculated as:
Thus, the critical value is 1.671.
Chapter 8 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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