Nine Students Took the SAT

question 102

Essay

Nine students took the SAT. Their scores are listed below. Later on, they read a book on test preparation and retook the SAT. Their new scores are listed below. Test the claim that the book had no effect on their scores. Use α =0.05 . Assume that the distribution is normally distributed.
$\begin{array} { l | c c c c c c c c c } \text { Student } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\\hline \text { Scores before reading book } & 720 & 860 & 850 & 880 & 860 & 710 & 850 & 1200 & 950 \\\hline \text { Scores after reading book } & 740 & 860 & 840 & 920 & 890 & 720 & 840 & 1240 & 970\end{array}$

---

Definitions:

Sales

The revenue a company generates from selling goods or services.

Consolidated Balance Sheet

A financial statement presenting the total assets, liabilities, and shareholders' equity of a parent company and its subsidiaries as one entity.

Patents

Exclusive rights granted to an inventor to manufacture, use, or sell an invention for a certain number of years.

Impairment Loss

A reduction in the recoverable value of a fixed asset or goodwill below its book value, leading to a write-down and charge against earnings.