Perform non-parametric hypothesis tests. For each hypothesis test, make sure to report on and label the following steps in your work:

1. Identify the null hypothesis, Ho, and the alternative hypothesis, Ha.
2. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed.
3. Find the critical value(s) and identify the rejection region(s).
4. Find the appropriate standardized test statistic. If convenient, use technology.
5. Decide whether to reject or fail to reject the null hypothesis.
6. Interpret the decision in the context of the original claim.

A random sample of nine students took the SAT test. and later on retook the test after taking a test preparation course. Their scores are listed below. Use the Wilcoxon signed-rank test to test the claim that the test preparation has no effect on their scores. Use = 0.05.

Student	1	2	3	4	5	6	7	8	9
Before	820	1180	840	1080	850	1010	1160	940	980
After	840	1180	830	1120	880	1020	1150	980	1000