Instructions: Answer all questions in the space below the # headers.

9.9 Exercises, Problem 2

Calculate and interpret a 95% confidence interval for the mean age of mothers from the Gestation data set from the mosaicData package.

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plot(cars)

9.9 Exercises, Problem 3

Use the bootstrap to generate and interpret a 95% confidence interval for the median age of mothers for the Gestation data set from the mosaicData package.

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9.10 Supplemental exerises, Problem 2a

Consider the results from the model of Dist as a function of Cond (first model). Briefly summarize what this model says about the relationship between the wind conditions and the distance travelled by the ball. Make sure to say something sensible about the strength of evidence that there is any relationship at all.

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9.10 Supplemental exerises, Problem 2b

Briefly summarize the model that has Dist as the response variable and includes the other variables as explanatory variables (second model) by reporting and interpreting the CondTail parameter. This second model suggests a somewhat different result for the relationship between Dist and Cond. Summarize the differences and explain in statistical terms why the inclusion of the other explanatory variables has affected the results.

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