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    Wilcoxon-Signed Rank Test

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    Wilcoxon-Signed Rank Test
    The 1997 price/earnings ratios for a sample of 12 stocks are shown in the following list ( Barron's, December 8, 1997). Assume that a financial analyst has provided the estimated price/earnings ratio for 1998. Using a .05 level of significance, what is your conclusion about the differences between the price/earnings ratios for 1997 and 1998?

    COMPANY 1997 P/E RATIO 1998 P/E RATIO
    Coca-Cola 40 32
    Du Pont 24 22
    Eastman Kodak 21 23
    General Electric 30 23
    General Mills 25 19
    IBM 19 19
    McDonalds 20 17
    Merck 29 19
    Motorola 35 20
    Philip Morris 17 18
    Walt Disney 33 27
    Xerox 20 16

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    Wilcoxon-Signed Rank Test
    The 1997 price/earnings ratios for a sample of 12 stocks are shown in the following list ( Barron's, December 8, 1997). Assume that a financial analyst has provided the estimated price/earnings ratio for 1998. Using a .05 level of significance, what is your conclusion about the differences between the price/earnings ratios for 1997 and 1998?

    COMPANY 1997 P/E RATIO 1998 P/E RATIO
    Coca-Cola 40 32
    Du Pont 24 22
    Eastman Kodak 21 23
    General Electric 30 23
    General Mills 25 19
    IBM 19 19
    McDonalds 20 17
    Merck 29 19
    Motorola 35 20
    Philip Morris 17 18
    Walt Disney 33 27
    Xerox 20 16

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