(a)
To determine the sample mean and standard deviation.
(a)
Answer to Problem 3CRE
The mean is
Explanation of Solution
It is given in the question,
The sample mean lies in the middle of the confidence interval, thus we have,
The margin of error will be as:
Now, we will find out the critical value using table B with degree of freedom as:
We also know that the margin of error of a confidence interval for the population mean is:
Thus, from above we have,
(b)
To comment on the interpretation.
(b)
Explanation of Solution
The interpretation given in the question is correct because the battery will either last between
(c)
To explain do you agree with the statement given in the question.
(c)
Answer to Problem 3CRE
No, we do not agree.
Explanation of Solution
No, we do not agree with the statement given in the question because if the sample mean on which the confidence interval is based, was very unlikely to occur by chance for a given population mean then the probability that a different sample mean is in the same confidence interval will be less than
(d)
To find out a statistically correct interpretation of the confidence interval that could be published in a newspaper report.
(d)
Explanation of Solution
It is given in the question,
And the mean is
Chapter 8 Solutions
The Practice of Statistics for AP - 4th Edition
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