A sample of n 100 scores is selected from a population with

A sample of n = 100 scores is selected from a population with m = 80 with s = 20. On average, how much error is expected between the sample mean and the population mean?

Solution

Standard Error= sd/ Sqrt(n)
Where,
sd = Standard Deviation
n = Sample Size

Standard deviation( sd )=20
Sample Size(n)=100
Standard Error = ( 20/ Sqrt ( 100) )
= 2