Many of your spreadsheets are in great shape, but where some people have the most problems is calculating s_pooled. I think this is mainly because it is the longest formula and the most complicated to double-check because it uses so many parentheses. As an optional download I'm providing a big one page handout, with color coding, showing two different ways you could calculate s_pooled in your spreadsheets. I hope this helps some of you. For others, this is another reference that may make future spreadsheet work a wee bit easier.
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