The accompanying table lists the numbers of House sittings in each of 18 Parliaments, randomly selected from three different time periods. Parliaments lasting less than a year were not sampled. Using a significance level of a = 0.05, test the claim that for the three periods sampled, the numbers of House sittings per Parliament are identical.

Use the Kruskal-Wallis test.

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Time Period 283 568 303 254 262 458 355 60s 292 366 565 390 447 687 405 707 767 590 Based on data from Duration of Sessions of Parliament, Library of Parliament.