Posted by christopher on Tuesday, December 11, 2012 at 3:36am.
A sample consists of the following data 7,11,12,18,20,22,25. What is the sample variance?

stat  PsyDAG, Tuesday, December 11, 2012 at 11:45am
Find the mean first = sum of scores/number of scores
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
I'll let you do the calculations. 
stat  christopher, Tuesday, December 11, 2012 at 11:54am
I got 42.95