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Ips claims that his secret sleep tapes cause people to become better at basic algebra...

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Ips claims that his secret sleep tapes cause people to become better at basic algebra All you have to do the doctor explains is listen to my tapes while you sleep at night and you ll be better at algebra in two months A math teacher at a local high school has expressed interest but demands evidence Five students from this school are randomly selected They take an algebra skills test listen to Dr Visegrips tape for two months while they sleep and then take a second test The test scores are given here Student Pretest Posttest elect one a b C Which of the following is the correct 99 confidence interval for the true mean difference posttest pretest in scores d e 1 48 1 2 4 604 5 70 6 69 4 3 250 1 48 1 2 4 604 4 1 2 2 576 1 48 1 2 2 576 76 143 Test scores A 68 70 2 972 3 362 5 5 B 69 68 C 74 75 D 71 72 E 65 68

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