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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

User Ahawtho
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2 Answers

1 vote
Standard Error of the Mean = SEM = SD/sqrt n
= 7.8/sqrt 85
= 0.846 round it up youll get 0.85
User Samball
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8.7k points
6 votes

Answer:

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.

User Luca Romagnoli
by
7.8k points