Question

A simple random sample of 64 observations was taken from a large population. the sample mean and the standard deviation were determined to be 320 and 120 respectively. the estimated standard error of the mean is

Answer 1

2110...................

Answer 2

Answer:

The estimated standard error of the mean is 15

Step-by-step explanation:

The standard error a sample mean is given by the following formula:

$SE = \frac{s}{\sqrt{n}}$

In which s is the standard deviation of the sample and n is the size of the sample.

In this problem, we have that:

$s = 120, n = 64$.

So

$SE = \frac{120}{\sqrt{64}} = 15$

The estimated standard error of the mean is 15