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Could I get a copy of your spreadsheet?
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Well, I don't have one set up for this specific purpose. If you are very new to spreadsheets, you can get a pretty good idea of how to set one up yourself by looking at
Homer's Streaks Thread
He is doing something different here, so your sheet will have different formulas. You will also be adding series for the confidence intervals. Homer shows how to do the confidence interval calculations
in this thread.
There is some work involved, but it should be worth it.