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These next two questions refer to the following information:
A researcher would like to estimate p, the proportion of U.S. adults who support stricter gun control laws.
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If the researcher would like to be 95% sure that the obtained sample proportion would be within 5% of p (the proportion in the entire population of U.S. adults), what sample size should be used?
20
400
1600
900
225
4
Good job! In order to estimate the population proportion, p, with a 95% confidence interval with a margin of error of m, we need a sample size of (at least) 1m21m2. In this case, the desired m is 5% = .05. Thus, the required n is 400 (remember, always round up for sample size).
ANSWER:
These next two questions refer to the following information:
A researcher would like to estimate p, the proportion of U.S. adults who support stricter gun control laws.