Nine Students Took the SAT A) (-30503, -0

question 34

Multiple Choice

Nine students took the SAT. Their scores are listed below. Later on, they read a book on test preparation andretook the SAT. Their new scores are listed below. Construct a 95% confidence interval for μd. Assume that thedistribution is normally distributed. $$\begin{array} { l | c c c c c c c c c } \text { Student } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\\hline \text { Scores before reading book } & 720 & 860 & 850 & 880 & 860 & 710 & 850 & 1200 & 950 \\\hline \text { Scores after reading book } & 740 & 860 & 840 & 920 & 890 & 720 & 840 & 1240 & 970\end{array}$$

• A) (-30.503, -0.617)
• B) (-20.341, 4.852)
• C) (-10.321, 15.436)
• D) (1.651, 30.590)

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