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A sample of 500 college students participated in a study designed to evaluate the level of college students' knowledge of a certain group of common

A sample of 500 college students participated in a study designed to evaluate the level of college students' knowledge of a certain group of common diseases. The following table shows the data.

	Disease Knowledge
Major	Good	Poor	Total
Premedical	31	91	122
Other	19	359	378
Total	50	450	500

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