A marketing firm tests three different brands of energy drinks to see how many equivalents of

potassium per quart each contains. The results are given below.

Brand A Brand B Brand C

4.7 5.3 6.3

3.2 6.4 8.2

5.1 7.3 6.2

5.2 6.8 7.1

5.0 7.2 6.6

a) Find the median for each brand.

b) State the null hypothesis used to test the medians.

c) Perform a Kruskal-Wallis test. Give the value of the test statistic.

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