b. To compute sign test: Both variables are subtracted from each other. This method would yield either negative or positive values as a result. Afterwards, we count the number of positive and negative values, but 0 is not included (take out the zero results). If you add up all the positive and negative values, you'll get your p-value by comparing it to the critical value table. To compute Wilcoxon test: Variables are compared to each other. After that, we compute the difference in terms of its a