Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
-Nine students took a standardized test. Their scores are listed below. Later on, they took a test preparation course and retook the test. Their new scores are listed below. Use the Wilcoxon signed-ranks test to find the test statistic T to test the hypothesis that the test preparation had no effect on their scores. Use $\alpha = 0.05$ .
$\begin{array}{lccccccccr}\hline \text { Student } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\\hline \text { Before Score } 1200 & 810 & 1090 & 1070 & 1080 & 990 & 800 & 1100 & 820 \\\text { After Score } & 1220 & 810 & 1080 & 1110 & 1110 & 1000 & 790 & 1140 & 840\end{array}$

A) 4
B) 32
C) 41
D) 2