The manager of a grocery store has taken a random sample of 100 customers.The average length of time it took these 100 customers to check out was 3 minutes.It is known that the standard deviation of the population of checkout times is 1 minute.The standard error of the mean equals
A) .001.
B) .010.
C) .100.
D) 1.000.

Question

Quizplus · Accepted Answer

The standard error of the mean is calculated as the population standard deviation divided by the square root of the sample size. Here, it is 1 minute / √100 = 0.100.

The Manager of a Grocery Store Has Taken a Random