Lesson: ESTIMATING POPULATION MEAN μ WHEN σ IS UNKNOWN OR ≥ 30 Please give a clear and understandable solution.(Degree of Freedom is present) 1.) In a study of a personnel services analytics, 20 managers were found to spend a mean of 2.5 hours each day on paper works with a standard deviation of 1.2 hours. Constuct a 90% confidence interval estimate of the average time spent on paper works by all managers.

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Q: 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 +0 .50000 .50399 .50798 .51197 .51595 .51994 52392 .527...

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