FILEFour independent samples produced the results in the accompanying table. The data are also available on the text website, labeled Exercise 20.26.

Sample 1 -1 5 0 5 10 Sample 2 J - 3 - 4 - 5 - 6 Sample 3 4 6 8 10 Sample 4 | 7 9 11 13

a. Specify the competing hypotheses in order to test whether differences exist between the medians.

b. What is the value of the test statistic H?

c. Approximate the p-value.

d. A t the 1% significance level, do the medians differ? Explain.

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