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December 18, 2014

December 18, 2014

Posted by **sarah** on Sunday, March 6, 2011 at 4:45pm.

B. Compute the mean amount spent per pupil for the large and the small districts. At the .05 significance level, can we conclude that there is a difference in the mean amount spent/

C. compute the mean daily percent of students attending for the large and small districts. At the .05 significance level, can we conclude that there is a difference in the mean daily attendance

- statistics -
**PsyDAG**, Monday, March 7, 2011 at 12:09pmWe do not have the data to do the computations. However, this might help.

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 = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

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