# Non paramteric test: Wilcoxon-Signed rank test

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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

(See attached file)

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##### Solution Summary

The solution uses Wilcoxon-Signed rank test to test the hypothesis that the price/earnings ratios for 1997 and 1998 are different.

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