APFIVE Sample Size and Confidence Interval Width
A researcher constructed a 90% confidence interval for a population proportion based on a sample of size n = 225. If the researcher wants to construct a new 90% confidence interval with a width that is 2/3 of the original width, approximately what sample size would be needed?
A
n = 150
B
n = 1013
C
n = 506
D
n = 338
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