A psychologist hypothesized that playing music or news radio during work may increase worker productivity. To test this hypothesis, she measured worker productivity (in units per hour) at three locations in a small business. Employees listened to music in one location, listened to news radio in a second location, or did not listen to radio during work in a third location. Based on the results shown in the table, test whether or not productivity levels differed using the Kruskal-Wallis H test at a .05 level of significance. State whether to retain or reject the null hypothesis.

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Music 32 34 36 40 28 News Radio 29 30 31 25 23 No Radio 26 38 20 18 27