A Time Study Analyst Is Determining the Standard Time for a Work

Multiple Choice

A time study analyst is determining the standard time for a work element. The select time is 6.0 minutes, and the standard deviation of the select time is 2.2 minutes, based on a pilot sample of 20 observations. What is the appropriate sample size if the estimate for the select time is to be within 10 percent of the True average time 95 percent of the time (z = 1.96) ?

A) fewer than 30 observations
B) greater than or equal to 30 observations but fewer than 40 observations
C) greater than or equal to 40 observations but fewer than or equal to 50 observations
D) greater than or equal to 50 observations