This webpage came up in a conversation over the weekend. Its one of those things that has been around for so long I thought everyone used it. This site by GraphPad will do statistical calcuations (unpaired student's t test, and Welch's t test) online in about 5 seconds. Cut the columns out of an Excel spreadsheet and paste it right into one of their two columns. Forget what p value is significant or extremely significant? Who cares, GraphPad will tell you. The only drawback is that you are limited to 2 sets for comparison. You have to buy the real version for more.
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