A non-parametric statistical test that compares two sample means from the same population to determine if they are equal
Question
A non-parametric statistical test that compares two sample means from the same population to determine if they are equal
Solution
The statistical test you're referring to is the Wilcoxon Signed-Rank Test. Here are the steps to perform this test:
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Rank the absolute differences between the two samples, ignoring the signs. The smallest difference gets a rank of 1, the second smallest a rank of 2, and so on.
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Sum the ranks for the positive differences (T+) and the ranks for the negative differences (T-).
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The test statistic, T, is the smaller of T+ and T-. If both are equal, use that value.
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Compare T to a critical value from a table of the Wilcoxon Signed-Rank Test. If T is less than or equal to the critical value, reject the null hypothesis that the two sample means are equal.
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If T is greater than the critical value, do not reject the
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