The data set represents the amounts of time (in minutes) spent checking email for a random sample
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The data set represents the amounts of time (in minutes) spent checking email for a random sample of employees at a company.
7.5 2.0 12.1 8.8 9.4 7.3 1.9 2.8 7.0 7.3
(a) Find the sample mean and the sample standard deviation.
(b) Construct a 90% confidence interval for the population mean. Interpret the results. Assume the times are normally distributed.
(c) Repeat part (b), assuming σ = 3.5 minutes. Compare the results.
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Related Book For
Elementary Statistics Picturing The World
ISBN: 9781292260464
7th Global Edition
Authors: Betsy Farber, Ron Larson
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