# Question

a. Obtain a value of the t statistic for the regression model of Exercise 11.86. Is there conclusive evidence that density is a predictor of sales?

b. Calculate a 95% confidence interval for the true value of the slope. The package should have calculated the standard error for you.

b. Calculate a 95% confidence interval for the true value of the slope. The package should have calculated the standard error for you.

## Answer to relevant Questions

Obtain a plot of the data of Exercise 11.86 with sales plotted against density. Does it appear that straight- line prediction makes sense? In exercise Obtain a plot of the data of Exercise 11.90, with durability on the vertical axis and concentration on the horizontal axis. a. What does this plot indicate about the wisdom of using straight- line prediction? b. What does ...Refer to the data of Exercise 12.13. The experiment was also concerned with the effects of high levels of copper in the chick feed. Five of the 10 chicks in each level of the feed additive received 400 ppm of copper, while ...Refer to Exercise 12.19. a. Provide a 95% confidence interval for the true coefficients associated with age and weight. b. Interpret the confidence intervals provided in part (a). Refer to Exercise 12.2. a. Write a second- order general linear model that allows for different slopes and intercepts for each mode of drive mechanism. b. Display the second- order regression equation for each of the three ...Post your question

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