Question

An SRS of size 20 is drawn from a population that has a normal distribution. The sample has a mean of 122.5 and a standard deviation of 8. Give the standard error of the mean:______

Answer 1

Answer:

The value is  $\sigma_{\= x} = 1.789$

Step-by-step explanation:

From the question we are told that

   The sample size is  n =  20  

    The sample mean is $\= x = 122.5$

    The standard deviation is  $s = 8$

Generally the standard error of the mean is mathematically represented as

       $\sigma_{\= x} = \frac{s}{\sqrt{n} }$

=>    $\sigma_{\= x} = \frac{8}{\sqrt{20 } }$

=>    $\sigma_{\= x} = 1.789$