Concept explainers
(a)
To Explain: the 99% confidence interval for mean include 15.
(a)

Answer to Problem 84E
Yes
Explanation of Solution
Given:
A 99% confidence interval corresponds with a significance test at the 100%-99%=1% significance level.
If the P-value is smaller than the significance level then the null hypothesis is rejected.
Since the null hypothesis failed to reject at the 1% significance level, the 99% confidence interval is having the value given in the null hypothesis
(b)
To Explain: the 95% confidence interval for mean include 15.
(b)

Answer to Problem 84E
No
Explanation of Solution
Given:
A 95% confidence interval associates with a significance test at the 100%-95%=5% significance level.
If the P-value is lesser than the significance level then the null hypothesis is rejected.
Since the null hypothesis reject at the 5% significance level, the 95% confidence interval is not having the value given in the null hypothesis
Chapter 9 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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