In a Wilcoxon signed rank sum test, the test statistic is calculated as T = 75 . If there are n = 15 observations for which D ? 0, and a two-tail test is performed at the 5% significance level, then:
a. reject the null hypothesis.
b. don't reject the null hypothesis.
c. the test results are inconclusive.
d. perform a parametric test.
B
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