A work sampling study requires an acceptable error level of 10 percent and z = 2 for 95.45 percent confidence. The adequate sample size is ________ if the sample proportion is thought to be as large as 50 percent, but ________ if the sample proportion is thought to be about 10 percent.
A) 50; 20
B) 100; 64
C) 100; 16
D) 20; 50
E) 100; 36

Question

Quizplus · Accepted Answer

The sample size formula for work sampling is n = (z^2 * p * (1-p)) / E^2. For p = 0.5, n = (2^2 * 0.5 * 0.5) / 0.1^2 = 100. For p = 0.1, n = (2^2 * 0.1 * 0.9) / 0.1^2 = 36.

A Work Sampling Study Requires an Acceptable Error Level of 10