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

1656_differences exist between the medians.png

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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