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.