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excercise10 (2)

# excercise10 (2) - Exercise Questions Chapter 10 10.1...

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Exercise Questions: Chapter 10 10.1 Understanding a linear regression model. Consider a linear regression model with μ y = 40.5 - 2.5 x and standard deviation = 2.0. (a) What is the slope of the population regression line? (b) Explain clearly what this slope says about the change in the mean of y for a change in x . (c) What is the subpopulation mean when x = 10? (d) Between what 2 values would approximately 95% of the observed responses, y , fall when x = 10? 10.7 What’s wrong? For each of the following, explain what is wrong and why. (a) The parameters of the simple linear regression model are b 0 , b 1 , and s . (b) To test H 0 : b 1 = 0, use a t test. (c) For a particular value of the explanatory variable x , the confidence interval for the mean response will be wider than the prediction interval for a future observation. 10.13 Beer and blood alcohol. How well does the number of beers a student drinks predict his or her blood alcohol content? Sixteen student volunteers at Ohio State University drank a randomly assigned number of 12-ounce cans of beer. Thirty minutes later, a police officer measured their blood alcohol content (BAC). Here are the data: 9

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