When the data are interval,how does the Wilcoxon signed rank sum test compare to the sign test?
A)Wilcoxon uses the information in the data more effectively.
B)Wilcoxon uses the information in the data less effectively.
C)Cannot compare the two tests without knowing the sample size.
D)None of these choices.

Question

Quizplus · Accepted Answer

The Wilcoxon signed rank sum test is more powerful than the sign test when the data are interval because it takes into account the magnitude of the differences between the paired values. It ranks the differences and uses the sign of the ranks to determine whether the median difference is significantly different from zero. The sign test, on the other hand, only considers the direction of the differences, not their magnitude. Therefore, the Wilcoxon test uses the information in the data more effectively.

When the Data Are Interval,how Does the Wilcoxon Signed Rank