A researcher wants to estimate the difference between the percentage of individuals without a high school diploma
Question:
A researcher wants to estimate the difference between the percentage of individuals without a high school diploma who smoke and the percentage of individuals with bachelor’s degrees who smoke. What sample size should be obtained if she wishes the estimate to be within 4 percentage points with 95% confidence, assuming that
(a) she uses the 1999 estimates of 32.2% of those without a high school diploma and 11.1% of those with a bachelor’s degree from the National Center for Health Statistics?
(b) she does not use any prior estimates?
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