a. To determine Find the critical value t α 2 to construct a 90% confidence interval. Explanation Calculation: The given information is that, a sample of size n = 22 which is drawn from a normal population. Here, the significance level is 0.10 and the degrees of freedom is 21 ( = 22 − 1 ) . For two-tailed test, the t α 2 is t α 2 = t 0.10 2 = t 0 b. To determine Explain whether the critical value would be smaller or larger when the sample size is n = 15 .

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Chapter 7.2, Problem 14E

To determine

Find the critical value tα2 to construct a 90% confidence interval.

To determine

Explain whether the critical value would be smaller or larger when the sample size is n=15.

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Chapter 7.2, Problem 13E

Chapter 7.2, Problem 15E

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Chapter 7 Solutions

Essential Statistics

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