To compute the necessary sample size for an interval estimate of a population proportion, all of the following procedures are recommended when p is unknown except
A) use the sample proportion from a previous study.
B) use the sample proportion from a preliminary sample.
C) use 1.0 as an estimate.
D) use judgment or a best guess.

Question

To compute the necessary sample size for an interval estimate of a population proportion, all of the following procedures are recommended when p is unknown except​
A) ​use the sample proportion from a previous study.
B) ​use the sample proportion from a preliminary sample.
C) ​use 1.0 as an estimate.
D) ​use judgment or a best guess.

Quizplus · Accepted Answer

Using 1.0 as an estimate for p (the population proportion) is not recommended because it suggests a population proportion of 100%, which is unrealistic for most practical situations. Instead, using a sample proportion from a previous study, a preliminary sample, or a judgment/best guess are more appropriate methods for estimating p when it is unknown.

To Compute the Necessary Sample Size for an Interval Estimate