Question

A randomly selected sample of 100 students had an average grade point average (GPA) of 3.2 with a standard deviation of 0.2.

The standard error of the sample mean is:
A. 0.020
B. 0.200
C. 1.600
D. 2.000

Answer 1

A. 0.020

Explanation:

we calculate the standard error of the sample mean with the formula,

`E=(s)/(√(n) )`,

with E= standard error of the sample mean

s= standard deviation

n= sample

So,

s= 0.2

n= 100

`E=(0.2)/(√(100) ) =(0.2)/(10)=0.02`