how to calculate the variance of test results in a class?

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how to calculate the variance of test results in a class?

this answers can be given by those who are qualified and have the degree of B.ED

2006-06-13 08:15:31 · 3 answers · asked by sunny 1 in Science & Mathematics ➔ Mathematics

3 answers

Just google it dear..very simple..calculate mean and average the sum of square of variation of each score from the mean.
http://davidmlane.com/hyperstat/A16252.html

2006-06-13 08:19:58 · answer #1 · answered by Vivek 4 · 1⤊ 0⤋

Let Ti = Test Scores, N=Number of Test Scores, s=variance, then

TMEAN= (SUM(Ti))/N and

s=SQUAREROOT(SUM((Ti-TMEAN)**2)/(N-1))

2006-06-13 15:57:29 · answer #2 · answered by Dennis W 1 · 0⤊ 0⤋

http://www.animatedsoftware.com/statglos/sgvarian.htm

2006-06-13 17:27:23 · answer #3 · answered by Sherman81 6 · 0⤊ 0⤋