An Industrial Engineer Is Conducting a Time Study for a Work

Multiple Choice

An industrial engineer is conducting a time study for a work element.The select time is 4.5 minutes,and the sample standard deviation of the observed time is 20 seconds.What is the appropriate sample size if the estimate is to be 5 percent of the true average time 95 percent of the time?

A) fewer than or equal to seven
B) greater than seven but fewer than or equal to eight
C) greater than eight but fewer than or equal to nine
D) greater than nine