Question 1 A student was studying the relationship between...

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CS&SS/SOC/STAT 221: Quiz 3 May 7, 2015 VERSION: A - solution Correlation Question 1 A student was studying the relationship between how much money students spend on food and on entertainment per week. Based on a sample size of 270, he calculated a correlation coefficient (r) of .013 for these two variables. Which of the following is an appropriate interpretation? a. This low correlation of .013 indicates there is no relationship. b. There is no linear relationship but there may be a nonlinear relationship. c. This correlation indicates there is some type of linear relationship.
For Questions 2 – 5, consider the five scatterplots that are shown below in Figure 1: Question 2 For which plot in Figure 1 would correlation be an inappropriate summary of the relationship between x and y?
Question 3 Based on the scatterplots in Figure 1, in which plot do x and y have a correlation (r) of 0.9?
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Question 4 Looking only at scatter plots 1 – 3 and 5 in Figure 1, in which plot do x and y have a correlation of 0?
Question 5 Based on the scatter plots in Figure 1, in which plot there is the strongest linear relationship between x and y? a. plot 1 b. plot 2 c. plot 3 d. plot 4 e. plot 5
2 Regression The following scatter plot displays the relationship between husbands’ and wives’ ages in a random sample of 170 married couples in Britain, where both partners’ ages are below 65 years.

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