Question

The standard deviation for a group is equivalent to the

		mean for that group
		range of scores for that group
		squared variance for that group
		square root of the variance for that group

Answer 1

Solution:
Standard deviation for a group is equivalent to square root of the variance for that group.
A variance of any group can be calculated as
Variance = ((Xi-mean)^2)/n

While standard deviation for a group can be calculated as
Standard deviation =sqrt(((Xi-mean)^2)/n)
So Standard deviation = sqrt(Variance)
So Standard deviation for a group is equivalent to square root of the variance for that group.