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Question 521:

The width of a confidence estimate for a proportion will be:
a. Narrower for a 99% confidence interval than for a 95% confidence interval.
b. Wider for a sample size of 100 than for a sample size of 50.
c. Narrower for 90% confidence than for 95% confidence
d. Narrower when the sample proportion is .50 than when the sample proportion is .20.

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