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

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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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