Attempts: Do No Harm: /4 Sign test vs. the t test for correlated groups Which of

Question

Attempts: Do No Harm: /4 Sign test vs. the t test for correlated groups Which of the following statements are true concerning the sign test and the t test for correlated groups? Check all that apply. The sign test and the t test for correlated groups always lead to the same conclusion. The sign test is usually a more powerful test than the t test for correlated groups. The sign test takes into account both the magnitude and direction of the differences, while the t test for correlated groups only takes into account the direction of the differences. The t test for correlated groups is usually a more powerful test than the sign test.

Explanation / Answer

We use sign test instead of t-test when we can assume that popualtion is normall distributed. Sign test is a non parameteric test and it less powerfull than t-test. Sign only uses the direction of differences that is sign of differences.

So only last option is correct.

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