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What does variance +/- 30 days mean in excel?

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I have a problem regarding to How to Calculate the Percent Variance in Excel

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I am trying to get the percent variance in cell c5 to not show the negative

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Calculate a variance between two values in %

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How can I test the alternative hypothesis for US and China sample populations that their economy growth rate is equal with Hypothesized Mean Difference of at least 2.5, significance level of 9.8%. Note that we are assuming that the variance is not equal. Much thanks

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