Posted by mary, can't figure out calculation, please show your calculations for all questions listed above a-e on Saturday, October 16, 2010 at 6:02pm.
I can't help you with statistics; however, let me give you something to think about. How many students can we help if we type all of the steps for one student. How many students can we help if YOU do the typing and we find the error. It's a lot more efficient for YOU to do the typing and us to the comparing than the other way around.
Range = highest value - lowest
For variance and standard deviation:
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.
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