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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 righttailed 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 twotailed test.
̂ and ̂ , so ̂ ̅...
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This document was uploaded on 04/03/2014.
 Spring '14

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