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Since 2007, the American Psychological Association has supported an annual nationwide survey to examine stress across...

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Statistics

Since 2007, the American Psychological Association has supportedan annual nationwide survey to examine stress across the UnitedStates. A total of 360 Millennials (18- to 33-year-olds) were askedto indicate their average stress level (on a 10-point scale) duringa month. The mean score was 5.4. Assume that the populationstandard deviation is 2.3.

(a) Give the margin of error for a 95% confidence interval.(Round your answer to three decimal places.)

Find the 95% confidence interval for this sample. (Round youranswers to three decimal places.)

(b) Give the margin of error for a 99% confidence interval.(Round your answer to three decimal places.)

Find the 99% confidence interval for this sample. (Round youranswers to three decimal places.)

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