Intro to Stat_Part_62

# Intro to Stat_Part_62 - 200 CHAPTER 12 LINEAR REGRESSION...

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Unformatted text preview: 200 CHAPTER 12. LINEAR REGRESSION AND CORRELATION a. What do you think the scatter plot will look like? Make a scatter plot of the data. b. Calculate the least squares line. Put the equation in the form of: ^ y = a + bx c. Find the correlation coefficient. What does it imply about the significance of the relationship? d. For the class of 1930, predict the total class gift. e. For the class of 1964, predict the total class gift. f. For the class of 1850, predict the total class gift. Why doesn’t this value make any sense? Exercise 12.20 We will use the columns “class year” and “average gift” for all questions, unless otherwise stated. a. What do you think the scatter plot will look like? Make a scatter plot of the data. b. Calculate the least squares line. Put the equation in the form of: ^ y = a + bx c. Find the correlation coefficient. What does it imply about the significance of the relationship? d. For the class of 1930, predict the average class gift. e. For the class of 1964, predict the average class gift. f. For the class of 2010, predict the average class gift. Why doesn’t this value make any sense? 12.3.1 Try these multiple choice questions Exercise 12.21 (Solution on p. 205.) A correlation coefficient of -0.95 means there is a ____________ between the two variables....
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Intro to Stat_Part_62 - 200 CHAPTER 12 LINEAR REGRESSION...

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