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# 3 compute a 90 confidence interval for the situation

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Unformatted text preview: e time between teenagers and adults. 3. Compute a 90% confidence interval for the situation in Practice Problem #1. 4. Compute a 99% confidence interval for the situation in Practice Problem #2. Answers to Practice Problems – To get full credit, you would have to show all of the following information. 1. and and ̂ ̂ , so we’ll do a right-tailed test. , so ̂ ̅ ̂ √ , so (̂ ̂) . ̅( ̅) ̅( ̅) ( , so -value ) , so since . Therefore we reject and support . That is, at the 5% significance level, we find enough evidence to say that the proportion of women who like chocolate is greater than the proportion of men who like chocolate. 2. and , so we’ll do a two-tailed test. ̂ and ̂ , so ̂ ̅...
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## This document was uploaded on 04/03/2014.

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