Write the Word or Phrase That Best Completes Each Statement $\alpha = 0.05$

Write the word or phrase that best completes each 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 test the hypothesis that the test preparation had no effect on their scores. Use $\alpha = 0.05$ .
$\begin{array}{lccccccccc}\hline \text { Student } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\\hline \text { Before Score } & 900 & 1170 & 880 & 1040 & 1050 & 960 & 1070 & 1140 & 980 \\\text { After Score } & 920 & 1170 & 870 & 1080 & 1080 & 970 & 1060 & 1180 & 1000 \\\hline\end{array}$