The mean number of hours of part-time work per week for a sample of 526 college...

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Question

math Statistics-And-Probability

Answer 1

Answer #1

Confidence Interval formula

Mean ± Margin of error

Lower Limit = Mean - Margin of Error

Lower Limit = 28 - 2.2 = 25.8

Upper Limit = Mean + Margin of Error

Upper Limit = 28 + 2.2 = 30.2

99% confidence interval is ( 25.8 , 30.2 ).

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Answer 2

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