Suppose we wish to find the required sample size to find a 90% confidence interval for the population proportion with the desired margin of error.If there is no rough estimate of the population proportion,what value should be assumed for ?
A) 0.05
B) 0.10
C) 0.50
D) 0.90

Question

Suppose we wish to find the required sample size to find a 90% confidence interval for the population proportion with the desired margin of error.If there is no rough estimate  of the population proportion,what value should be assumed for  ?
A) 0.05 
B) 0.10 
C) 0.50 
D) 0.90

Quizplus · Accepted Answer

Without a rough estimate of the population proportion, it is safest to assume the most conservative value, which is 0.50 (50/50 chance of the event occurring/not occurring). This conservative assumption will result in the largest sample size needed to achieve our desired margin of error.

Suppose We Wish to Find the Required Sample Size to Find