Do I divide the total variance by the number of scores inside the loop?
The step asking you to divide the total
variance by the number of
scores should be done outside of the
for loop, otherwise your number will be far smaller than it should be because you divide it at each step.
Calculating a variance involves squaring the distance from the average of each score, summing those up, and then, after all that, dividing the summed variance by the number of scores.
In pseudo code, the process looks like this:
set variance to 0 for each score: variance = (distance of score from average) squared return variance / number of scores
And be sure to