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Example Questions
Example Question #1 : How To Find Confidence Intervals For A Proportion
A health insurance executive suspects that 50% of insurance applications are incomplete (i.e. critical data is missing from the application). He wants to gather a sample to estimate the true proportion. He wants to be within 5% of the true mean with 95% confidence.
What sample size does he need?
Possible Answers:
375
385
405
395
365
Correct answer:
385
Explanation:
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