Posted by favor on .
1.what is the standard deviation of these values
first 7:57,61,57,57,58,57,61 and
second 7:61,52,69,64,46,54,47
2. compare the two sets and describe what you discover.

statistics 
PsyDAG,
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.
Standard deviation = square root of variance
I'll let you do the calculations.