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February 1, 2015

February 1, 2015

Posted by **Lezlie** on Wednesday, June 11, 2008 at 1:18am.

On their own

n=10

M=78

SS=1420

Given Solutions

n=15

M=66

SS=2030

ss stands for sum of squares

- statistics -
**PsyDAG**, Thursday, June 12, 2008 at 2:24amTo find the significance of the difference between two means, we need to divide this difference by the standard error of the difference between means.

To find the standard error of the difference between means, we need to know the standard deviation (SD) of both groups.

To get the standard SD, you need both sum of squares (ΣX^2) and the sum of the scores squared ([ΣX]^2). You only give me one of these terms.

We need more information — or the corect information.

I hope this helps. Thanks for asking.

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