Final Practice Problems - FR - Answers

Therefore i conclude that adult males have not gotten

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Unformatted text preview: at the 5% significance level. Therefore, I conclude that adult males have not gotten taller since 1900. Final Practice Problems – Free Response - Answers Question 3 In 1988, 75% of American children age 11 and younger went trick-or-treating on Halloween. After Halloween 2011, 175 American children age 11 and younger were randomly surveyed. 112 of them reported that they had gone trick-or-treating. a) Estimate the true proportion of American children that went trick-or-treating in 2011 with 90% confidence. ̂ ( ̂) √ ̂( ̂) ( √ ( ̂) ̂ ) ( ) [0.581, 0.699] I am 90% confident that the true proportion of American children that went trick-or-treating in 2011 is between 0.581 and 0.699. b) Does this provide evidence that trick-or-treating has become less popular? Use a 5% significance level. ̂ (from part a) () √ ( ) √ ̂ () ( ) Final Practice Problems – Free Response - Answers ( ) The results are statistically significant at the 5% significance level. Therefore, I reject the null hypothesis and conclude that trick-or-treating has declined in popularity since 1988....
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