Question: Does polyester decay? Exercise 18.8 (text page 482) compares the breaking strength of polyester strips buried for 16 weeks with that of strips buried for

Does polyester decay? Exercise 18.8 (text page 482) compares the breaking strength of polyester strips buried for 16 weeks with that of strips buried for 2 weeks.

The breaking strengths in pounds are 2 weeks 118 126 126 120 129 16 weeks 124 98 110 140 110

(a) What are the null and alternative hypotheses for theWilcoxon test? For the two-sample t test?

(b) There are two pairs of tied observations. What ranks do you assign to each observation, using average ranks for ties?

(c) Apply the Wilcoxon rank sum test to these data. Compare your result with the P = 0.1857 obtained from the two-sample t test in Figure 18.5.

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