Question

If the standard deviation of a normally distributed population is 20.0 and we take a sample of size 4, then the standard error of the mean is

Answer 1

Solution: The standard error of the mean is given below:

`(20)/(√(4))`

`10`

Therefore the standard error of mean is 10

Answer 2

10

Explanation:

Thinking process:

The standard error is given by this formula:
`SE = (\sigma )/(√(n) )`

where SE is the standard error

`\sigma` = the standard deviation

n = sample size or the number of items

Then the error is given by:

`SE = (20)/(√(4) ) \\ = (20)/(2) \\ =10`

Therefore, the standard error is 10