Nine Students Took the SAT Test $\text { Use } \alpha = 0.05 \text {. }$

question 49

Essay

Nine students took the SAT test. Later, they took a test preparation course and retook the SAT. Their original scores and new scores are shown below. Use the Wilcoxon signed rank test to test the claim that the test preparation had an effect on their scores. $\text { Use } \alpha = 0.05 \text {. }$ $$\begin{array} { l c c c c c c c c c } \hline \text { Student } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\\hline \text { Before Score } 930 & 810 & 900 & 870 & 1120 & 910 & 940 & 980 & 1080 \\\text { After Score } & 950 & 810 & 890 & 910 & 1150 & 920 & 930 & 1020 & 1100 \\\hline\end{array}$$

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Definitions:

Advertising Expense

The cost incurred by an organization to promote its products, services, or brand in various media.

Underapplied

A situation where the allocated manufacturing overhead costs are less than the actual overhead costs incurred, leading to a cost variance.

Manufacturing Overhead

All indirect costs related to the manufacturing process, including but not limited to utilities, rent, and maintenance of equipment.

Expired Insurance

An insurance policy that has reached its end date and is no longer in effect.