Chapter 14: Q 7 (page 588)
For a particular value of a predictor variable, is there a difference between the predicted value of the response variable and the point estimate for the conditional mean of the response variable? Explain your answer.
No there is no difference
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Plant Emissions. Use the data on plant weight and quantity of volatile emissions from Exercise 14.25.
a. compute the standard error of the estimate and interpret your answer
b. interpret your result from part (a) if the assumptions for regression inferences hold.
c. obtain a residual plot and a normal probability plot of the residuals.
d. decide whether you can reasonably consider Assumptionsfor regression inferences to be met by the variables under consideration. (The answer here is subjective, especially in view of the extremely small sample sizes.)
Following are the age and price data for corvettes, use
presuming that the assumption for regression inference are met, decide at the specified significance level whether the data provide sufficient evidence to conclude that the predictor variable is useful for providing the response variable.
PCBs and Pelicans. Use the data points given on the WeissStats site for shell thickness and concentration of PCBs for 60 Anacapa pelican eggs referred to in Exercise 14.40.
Figure shows three residual plots and a normal probability plot of residuals. For each part, decide whether the graph suggests a violation of one or more of the assumptions for regression inferences. Explain your answers.
Corvette Prices. Use the age and price data for Corvettes from Exercise 14.23.
a. compute the standard error of the estimate and interpret your answer
b. interpret your result from part (a) if the assumptions for regression inferences hold.
c. obtain a residual plot and a normal probability plot of the residuals.
d. decide whether you can reasonably consider Assumptions for regression inferences to be met by the variables under consideration. (The answer here is subjective, especially in view of the extremely small sample sizes.)
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