A time study of a certain service task found an average time of 15 minutes,with a standard deviation of 5 minutes.These figures were based on a sample of 100 measurements.Is the sample large enough that we are 95% confident that standard time is within ±5% of its true value?

Question

Quizplus · Accepted Answer

The Answer of A time study of a certain service task found an average time of 15 minutes,with a standard deviation of 5 minutes.These figures were based on a sample of 100 measurements.Is the sample large enough that we are 95% confident that standard time is within ±5% of its true value?

A Time Study of a Certain Service Task Found an Average