Concept explainers
To calculate: The
Answer to Problem 55E
The required sample size is 373.
Explanation of Solution
Given Information:
Margin of error
Confidence interval = 99%
Standard deviation
Formula Used Sample size
Calculation:
Confidence interval is 99%.
Convert 99% into decimal.
For confidence interval 0.99, use table A.
Find the sample size. Use the formula
Hence, the required sample size is 373.
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