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In: Statistics and Probability

Show all work including steps used during computations using formulas and diagrams when appropriate. Include a...

Show all work including steps used during computations using formulas and diagrams when appropriate. Include a statement explaining the meaning of your computations (conclusions) for all problems- hypothesis tests and confidence intervals.

The IRS claims that it takes 87 minutes to prepare a tax form. You believe it takes longer than 87 minutes. You ask 21 tax filers and find the following preparation times:

61, 69, 75, 79, 87, 89, 94, 96, 97, 98, 98, 99, 100, 100, 105, 108, 110, 117, 119, 122, 125

Determine if the preparation time is significantly longer than 87 minutes. Use α = .025.

Solutions

Expert Solution

Let denotes the mean preparation time.

orchestra answered 2 years ago
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