A study compares the means of two groups, each having N = 10. If the standard deviations in the two groups are 3.00 and 5.00, what is the value for the standard error of the difference ?
A) .89
B) 1.84
C) 3.40
D) 8.00

Question

A study compares the means of two groups, each having N = 10. If the standard deviations in the two groups are 3.00 and 5.00, what is the value for the standard error of the difference  ?
A) .89 
B) 1.84 
C) 3.40 
D) 8.00

Quizplus · Accepted Answer

The formula for standard error of the difference is:
SE = sqrt((s1^2 / N1) + (s2^2 / N2))
SE = sqrt((3^2 / 10) + (5^2 / 10))
SE = sqrt(9/10 + 25/10)
SE = sqrt(34/10)
SE = 1.84

A Study Compares the Means of Two Groups, Each Having