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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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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