Random sample of 150 viewers last night revealed 53 watched, Ask an Expert

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In the particular market there are three commercial television stations, each with its own evening news program from 6:00 to 6:30 P.M. According to the report in morning's local newspaper, random sample of 150 viewers last night revealed 53 watched news on WNAE, 64 watched on WRRN, and 33 on WSPD. At .05 significance level, is there a difference in proportion of viewers watching three channels?

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