Suppose that, based on a sample, the 95%% confidence interval for the mean of a population is (21,37). What is the value of s/√n?

A. 4

B. 3

C. 5

D. 2

A. 4

Step-by-step explanation:

Based on a sample, the 95%% confidence interval for the mean of a population is (21,37). Therefore, the value of s/√n is 4.

A. 4

Step-by-step explanation:

s/√n is the sample standard deviation. 95% is approximately between ±2 standard deviations, so the ends of the interval are 4 standard deviations apart.

s/√n = (37 - 21) / 4

s/√n = 4