A study compares the means of two groups, each having N = 11. If the standard deviations of the two groups are 5.00 and 3.00, what is the value for the standard error of the difference ?
A) .60
B) .85
C) 1.76
D) 3.09

Question

A study compares the means of two groups, each having N = 11. If the standard deviations of the two groups are 5.00 and 3.00, what is the value for the standard error of the difference  ?
A) .60 
B) .85 
C) 1.76 
D) 3.09

Quizplus · Accepted Answer

The formula for standard error of the difference between two means is: 
Standard Error = sqrt[(s1^2/N1) + (s2^2/N2)]
Plugging in the values, we get: 
Standard Error = sqrt[(5^2/11) + (3^2/11)] = 1.76. Therefore, the answer is C.

A Study Compares the Means of Two Groups, Each Having