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A random sample of 16 pharmacy customers showed waiting times below (in minutes).

21        22        22        17        21        17        23        20

20        24        9          22        16        21        22        21

Required:

Find out a 90 percent confidence interval for μ, supposing that the sample is from the normal population.

The 90% confidence interval    .............to..............

Statistics and Probability, Statistics

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