A sociologist suspects differences in median incomes in three major eastern cities. He randomly samples 100 workers from each city. The top of Table 20.14 shows a portion of the data; the full data set can be found on the text website, labeled City Income.

Unsure that the median income is the same in each city, he uses Minitab to conduct a Kruskal-Wallis test and produces the results shown at the bottom of Table 20.14. Can he conclude that median incomes differ at the 5% significance level?