Refer to Exercise 15.11. That analysis did not take into account the magnitudes of the differences in reaction times. Show how to do this with the Wilcoxon signed-ranks test, illustrating by using only the four observations shown in the table there.
a. State the hypotheses for the relevant one-sided test.
b. Create the sampling distribution of the sum of ranks for the positive differences.
c. Find the P-value, and interpret.

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Reaction times in cell phone study Using Cell Phone? Yes 636 623 615 672 Student No 604 556 540 Difference 32 67 75 150