Concept explainers
To find: The
Answer to Problem 3.2CYU
The sample size is 1180.
Explanation of Solution
Given:
Population proportion
Margin of error ( E ) = 3% = 0.03
Confidence level = 99%
Formula used:
The formula to compute the sample size is:
Calculation:
From the standard normal table, the z-score at 99% confidence level is 2.579
The sample size is calculated as:
Thus, the required sample size is 1180.
Conclusion:
From the above calculations, it is clear that the increase in confidence level is leading increase in the sample size.
Chapter 8 Solutions
The Practice of Statistics for AP - 4th Edition
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