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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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U.S. Presidents. The data from Exercise for the ages at inauguration and of death for the presidents of the United States are on the Weiss Stats site.
In this Exercise 14.49, we repeat the information from Exercises 14.13.
a. Decide, at the significance level, whether the data provide sufficient evidence to conclude that is useful for predicting :
b. Find a confidence interval for the slope of the population regression line.
we repeat the data and provide the sample regression creations
a. Determine the standard error of the estimate
b. Construct of residual plot.
c. Construct a nommal probability plot of the residuals.
| x | 2 | 4 | 3 |
| y | 3 | 5 | 7 |
The data from Exercise 14.43 for volume, in cubic feet, and diameter at breast height, in inches, for 70 shortleaf pines are on the WeissStats site.
In Exercises 14.98-14.108, use the technology of your choice to do the following tasks.
a. Decide whether your can reasonably apply the conditional mean and predicted value t-interval procedures to the data. If so, then also do parts .
b. Determine and interpret a point estimate for the conditional mean of the response variable corresponding to the specified value of the predictor variable.
c. Find and interpret a confidence interval for the conditional mean of the response variable corresponding to the specified value of the predictor variable.
d. Determine and interpret the predicted value of the response variable corresponding to the specified value of the predictor variable.
e. Find and interpret a prediction interval for the value of the response variable corresponding to the specified value of the predictor variable.
f. Compare and discuss the differences between the confidence interval that you obtained in part (c) and the prediction interval that you obtained in part (e).
14.101 Acreage and Value. The data from Exercise for lot size (in acres) and assessed value (in thousands of dollars) of a sample of homes in a particular area are on the WeissStats site. Specified value of the predictor variable: acres.
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