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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Since the U test statistic calculated (68) falls below the critical value for alpha = .05 (which is 79 for a sample size of 12+15=27), we reject the null hypothesis and conclude that the median speed on the section of highway is different for cars and trucks.

Recently,a Study Was Done to Determine Whether the Median Speed