Homework Help: Statistics: Range, Average Deviation, Standard Dev

Posted by Joy Chapman on Tuesday, October 18, 2011 at 1:44am.

Can someone please help me with the following math problems? I am totally lost and confused.

Calculate the range, average deviation, and standard deviation for the following five distributions:

A. 1, 2, 3, 4, 5, 6, 7, 8, 9

B. -4, -3, -2, -1, 0, 1, 2, 3, 4

C. 10, 20, 30, 40, 50, 60, 70, 80, 90

D. 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8., 0.9

E. 100, 200, 300, 400, 500, 600, 700, 800, 900

Statistics: Range, Average Deviation, Standard Dev - PsyDAG, Tuesday, October 18, 2011 at 2:42am
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.

Subtract each of the scores from the mean, add the differences and divide by the number of scores = average deviation.

Range = highest score-lowest score.

I'll let you do the calculations.
Statistics: Range, Average Deviation, Standard Dev - Joy Chapman, Tuesday, October 18, 2011 at 12:51pm
Thanks for the instructions. I will work on it now that I have thorough instructions on how to come up with the range, average deviation, and standard deviation.

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