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The test scores on a 100-point test were recorded for 20 students:
71 93 91 86 7573 86 82 76 5784 89 67 62 7277 68 65 75 84
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. Do the sample data suggest that the average test score is more than 75? Use α = 0.05.
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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