Posted by jo on Monday, September 19, 2011 at 7:21pm.
given the following population data, x=17,13,23,15,19,19,21,28 calculate the z score value for a score of 18.

statistics  PsyDAG, Tuesday, September 20, 2011 at 2:51am
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
Z = (scoremean)/SD
I'll let you do the calculations.