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...

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? Is the sample size given enough?