Concept explainers
To calculate: The total
Answer to Problem 46E
The required sample size is356.
Explanation of Solution
Given information:
Margin of error
Sample proportion
Confidence interval = 90%
Formula used:
Sample size
Calculation:
Confidence interval is 90%.
Convert 90% into decimal.
For confidence interval 0.90, use table A.
Sample proportion
Convert 70% into decimal.
Calculate the sample size. Use the formula
Hence, the required sample size is 356.
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