Question

PLEASE HELP!! I NEED THE ANSWER ASAP

The standard deviation of a population is known to be 7.8. If the sample size is 85, what is the standard error of the mean?

A.0.22

B.0.85

C.1.047

D.6.008

Answer 1

Standard Error of the Mean = SEM = SD/sqrt n
= 7.8/sqrt 85
= 0.846 round it up youll get 0.85

Answer 2

0.85

Explanation:

We are given that The standard deviation of a population is known to be 7.8.

So,
`\sigma = 7.8`

Population size N = 85

Formula of standard error of the mean =
`(\sigma)/(√(N))`

Substitute the values in the formula:

So, standard error of the mean =
`(7.8)/(√(85))`

=
`0.8460`

Thus the standard error of the mean is 0.85

Hence Option B is correct.