Computing the Necessary Sample Size for an Interval Estimate of a Population

Multiple Choice

Computing the necessary sample size for an interval estimate of a population proportion requires a planning value for $\bar{p}$ . In case of any uncertainty about an appropriate planning value, we know the value that will provide the largest sample size for a given level of confidence and a given margin of error is

A) .10
B) .50
C) .90
D) 1