Suppose the time it takes for a purchasing agent to complete an online ordering
Process is normally distributed with a mean of 8 minutes and a standard deviation of 2
Minutes. Suppose a random sample of 25 ordering processes is selected. The standard
Deviation of the sampling distribution of mean times is
A) 0.4 minutes
B) 2 minutes
C) 0.08 minutes
D) 1.6 minutes
E) 0.12 minutes

Question

Quizplus · Accepted Answer

The standard deviation of the sampling distribution (standard error) is calculated as the population standard deviation divided by the square root of the sample size: 2 / √25 = 0.4 minutes.

Suppose the Time It Takes for a Purchasing Agent to Complete