I am having problems calculating the standard deviation, standard error and t test values using mostly negative numbers. Here is my data (which is the difference in scores)after a weightloss study: -3,-11,-9,2,-1,-11,3,-8,-7,-3.

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I am having problems calculating the standard deviation, standard error and t test values using mostly negative numbers. Here is my data (which is the difference in scores)after a weightloss study: -3,-11,-9,2,-1,-11,3,-8,-7,-3.

Mathematics
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Hello, I'm leaving soon, but I can direct you to some clips that may help, if you'd like?
Standard deviation: http://www.khanacademy.org/v/statistics--standard-deviation?p=Statistics Standard error: http://www.khanacademy.org/v/standard-error-of-the-mean?p=Statistics t-test: http://www.youtube.com/watch?v=_mof61Totx4&feature=relmfu
Thank you very much!

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