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18. A researcher wishes to be 95% confident that her estimate of the true proportion of...
18. A researcher wishes to be 95% confident that her estimate of the true proportion of individuals who travel overseas is within 3% of the true proportion.
a) Find the sample necessary if, in a prior study, a sample of 200 people showed that 40 traveled overseas last year. b)
b) If no estimate of the sample proportion is available, how large should the sample be?
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