In analyzing the consumption of cottage cheese by members of
In analyzing the consumption of cottage cheese by members of various occupational groups, the United Dairy Industry Association found that 326 of 837 professionals seldom or never ate cottage cheese, versus 220 of 489 white- collar workers and 522 of 1243 blue-collar workers. Assuming independent samples use the 0.05 level in testing the null hypothesis that the population proportions could be the same for the three occupational groups.
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