(a)
To calculate: The standard deviation
(a)
Answer to Problem 61E
The standard deviation is91.2647.
Explanation of Solution
Given information:
Standard error of mean
Formula used:
Standard error of mean
Calculation:
Standard error of mean is
Multiply both side by
Hence, the required standard deviation is 91.2647.
(b)
Explain the reason why the given interval is not a confidence interval.
(b)
Answer to Problem 61E
The given interval is not a confidence interval
Explanation of Solution
Formula used:
The confidence interval =
The formula for the confidence interval is
In the problem interval is
Hence, the given interval is not a confidence interval.
Chapter 8 Solutions
The Practice of Statistics for AP - 4th Edition
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