=+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