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,the test critical U value is 49.

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The critical value for the Mann-Whitney U test with n1 = 12, n2 = 15, and alpha = .05 is 49.

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