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Q1) Prof. Hardtack gave 3 exams last semester in large lecture class. Standard deviation σ = 7 was same on all 3 exams, and scores were normally distributed. Below are scores for 10 randomly selected students on each exam.
Exam 1:
71, 69, 78, 80, 72, 76, 70, 82, 76, 76.
Exam 2:
77, 66, 71, 73, 94, 85, 83, 72, 89, 80.
Exam 3:
67, 69, 64, 65, 72, 59, 64, 70, 64, 56.
95% confidence interval for the mean scores on:
Exam 1 ..............to...............
Exam 2 .................to.............
Exam 3 ................to...............
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