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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

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. Construct a 95% confidence interval for

d.

Assume that the distribution is normally distributed.

Student

1

2

3

4

5

6

7

8

9

Scoresbeforereadingbook

720

860

850

880

860

710

850

1200

950

Scoresafterreadingbook

740

860

840

920

890

720

840

1240

970

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