Question

A population has a mean of 90 and a standard deviation of 15. A random sample of 100 is selected. What is the standard error?

Answer 1

We have,

$Population \ Mean = \mu = 90 \ Standard \ Deviation = \sigma = 15$

And $n=100$

Now Standard error is,

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

$SE=\frac{15}{\sqrt{100}}$

$SE=\frac{15}{10}$

$SE=1.5$

Hence Standard Error is 1.5