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Back to 8.1 A Single Population Mean Using the Normal Distribution

8.1 Exercise 2

Avg difficulty 2.5

Suppose scores on exams in statistics are normally distributed with an unknown population mean and a population standard deviation of three points. A random sample of 36 scores is taken and gives a sample mean (sample mean score) of 68. Find a confidence interval estimate for the population mean exam score (the mean score on all exams).

Find a 90 percent confidence interval for the true (population) mean of statistics exam scores.

OpenStax Statistics, 8.1 A Single Population Mean Using the Normal Distribution, exercise 2

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