Nine students took the sat. their scores are listed below. later on


Nine students took the sat. their scores are listed below. later on

Nine students took the SAT. Their scores are listed below. Later on they took a test preparation course and retook the SAT. Their new scores are listed below. Construct a 95% confidence interval for ud – means difference. Assume that the distribution is normally distributed. 
student 1 2 3 4 5 6 7 8 9before 720 860 850 880 860 710 850 1200 950740 860 840 920 890 720 840 1240 970 

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