The following table shows the audience shares of the three major networks€™ evening news broadcasts in four major cities as reported by Arbitron. Test at the α = 0.10 level of significance the null hypothesis that viewing levels for news are the same for ABC, CBS, and NBC.

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City ABC CBS 19.7 18.6 19.1 17.9 16.1 15.8 14.6 17.1 NBC 18.2 15.3