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    One, Two-Sample Tests of Hypothesis, Variance,and Chi-square

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    One, Two-Sample Tests of Hypothesis, Variance, and Chi-squared Analysis

    Exercises 19 and 20 (Ch. 17)

    19. In a 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 a report in this morning's local
    newspaper, a random sample of 150 viewers last night revealed 53 watched the news
    on WNAE (channel 5), 64 watched on WRRN (channel 11), and 33 on WSPD (channel 13).
    At the .05 significance level, is there a difference in the proportion of viewers watching
    the three channels?

    20. There are four entrances to the Government Center Building in downtown Philadelphia.
    The building maintenance supervisor would like to know if the entrances are equally utilized.
    To investigate, 400 people were observed entering the building. The number using
    each entrance is reported below. At the .01 significance level, is there a difference in the
    use of the four entrances?

    Entrance Frequency
    Main Street 140
    Broad Street 120
    Cherry Street 90
    Walnut Street 50
    Total 400

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