3. Exercise 10.4 (p. 397) Test Scores. The test scores on a 100-point test were recorded for 20 students: 71 73 84 77 a.) Can you reasonably assume that these test scores have been selected from a normal population? Use a stem and leaf plot to justify your answer. b.) Calculate the mean and standard deviation of the scores. c.) If these students can be considered a random sample from the population of all students, find a 95% confidence interval for the average test score in the population.
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