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.

Question

The standard deviation of the sampling distribution of mean times is

Answer 1

I think you are asking about the Standard Error of the mean (SEm).

SEm = SD/√n

Answer 2

23