A Work Sampling Study Requires an Acceptable Error Level of 10

Multiple Choice

A work sampling study requires an acceptable error level of 10% and z = 2 for 95.45% confidence. The adequate sample size is ________ if the sample proportion is thought to be as large as 50%, but ________ if the sample proportion is thought to be about 20%.

A) 50;20
B) 100; 64
C) 100; 16
D) 20; 50
E) cannot be determined from the information given