SOLUTION: For a random sample of 22 people who took a test, the mean score is 85.1 and the standard deviation is 12.9. What is the 90% confidence interval for the mean score of all the test
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Question 868643: For a random sample of 22 people who took a test, the mean score is 85.1 and the standard deviation is 12.9. What is the 90% confidence interval for the mean score of all the test takers, assuming that the population is normally distributed?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
ME =1.645(12.9/sqrt(22))
CI: 85.1-ME < u < 85.1 + ME
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