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For statistics expert
The data in the table are simulated exam scores. Suppose the exam was given in the semester after the course content was revised, and the previous mean exam score was 70. We would like to know whether or not the mean score has increased. Answer the following question using any approximate method by stating the necessary assumptions. The data are here: Simulated Exam Scores 75 70 88 80 80 66 65 68 85 80 78 72 69 75 86 96 77 81 76 80 66 65 78 87 88 75 85 84 66 78 76 74 85 64 76 75 76 74 81 76 (a) State the null and alternative hypothesis, and carry out the hypothesis test using the significance level of α-: 0.05. (b) Construct a 90% confidence interval for the mean score.
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