A population proportion is to be estimated and a 95% degree of confidence is desired. In general, if one wishes to decrease the margin of error by a factor of 5 (for example from E = 0.05 to 0.01), by what numerical factor will the necessary sample size increase?
A)25
B)24
C)5
D)20

Question

Quizplus · Accepted Answer

The necessary sample size increases by a factor of the square of the decrease in the margin of error, so $5^2 = 25$.

A Population Proportion Is to Be Estimated and a 95