Perform the Indicated Wilcoxon Test $$\alpha = 0.05 \text {. }$$

question 50

Essay

Perform the indicated Wilcoxon test. Be sure to do the following: Identify the claim mathematically and state the null
and alternative hypotheses. Determine the critical value and find the test statistic. Decide whether to reject or fail to
reject the null hypothesis and 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 $$\alpha = 0.05 \text {. }$$ $$\begin{array} { l c c c c c c c c c } \hline \text { Student } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\\hline \text { Before Score } &820 & 1180 & 840 & 1080 & 850 & 1010 & 1160 & 940 & 980 \\\text { After Score } & 840 & 1180 & 830 & 1120 & 880 & 1020 & 1150 & 980 & 1000 \\\hline\end{array}$$

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Definitions:

Retailer

A business that sells goods to the public in relatively small quantities for use or consumption rather than for resale.

Sales Commissions

Compensation paid to sales employees, usually calculated as a percentage of the sales they generate.

Freight In

The cost of transporting goods into a business, typically considered as part of the cost of goods purchased.

Quantity Discounts

Price reductions given to customers who purchase large quantities of a product, encouraging bulk buying.