5.16 In an experiment to measure the effect of mild intoxication on coordination, nine subjects were each given ethyl alcohol in an amount equivalent to 15.7 ml=m2 of body surface and then asked to write a certain phrase as many times as they could in 1 minute. The number of correctly written words was then counted and scaled such that a zero score represents the score a person not under the influence of alcohol would make, a positive score indicates increased writing speed and accuracy, and a negative score indicates decreased writing speed and accuracy. For the data below, find a confidence-interval estimate of the median score at level nearest 0.95 using the procedure corresponding to the

(a) Sign test

(b) Wilcoxon signed-rank test where we assume symmetry Subject Score Subject Score 1 10 6 0 2 8 7 7 3 6 8 5 4 2 9 8 5 15