Question

A sample of 100 footballs showed an average air pressure of 13 psi. The standard deviation of the population is known to be .25 psi. What is the standard error of the mean?

Answer 1

0.025 is the standard error of mean.

Explanation:

We are given the following in the question:

Sample size, n = 100

Sample mean = 13 psi

Population standard deviation = 0.25 psi

We have to find the standard error of the mean.

Formula:

Standard error =

`(\sigma)/(√(n)) = (0.25)/(√(100)) = (0.25)/(10) = 0.025`

0.025 is the standard error of mean.