Recently, a study was done to determine whether the median speed on a section of highway is the same for cars versus trucks. A sample of 12 cars (n1 = 12) and 15 trucks (n2 = 15) was collected. If the Mann-Whitney U test is to be performed using an alpha = .05 and if the U test statistic is calculated to be 68, the null hypothesis should be rejected.

Question

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The Mann-Whitney U test is a non-parametric test used to compare the medians of two independent samples. The null hypothesis for the Mann-Whitney U test is that the medians of the two samples are equal. If the U test statistic is less than or equal to the critical value, the null hypothesis is rejected. In this case, the U test statistic is 68, which is greater than the critical value of 67 for alpha = .05. Therefore, the null hypothesis should be rejected.

Recently, a Study Was Done to Determine Whether the Median