# Researchers at a university used volunteers

Use the following information for problems 13 to 17.Researchers at a university used volunteers from classes they taught who were Facebook users as their subjects. Each subject was shown the same fake Facebook page and was asked to rate the “social attractiveness” of the page’s owner. The pages shown were all the same except that researchers randomly changed the number of “Facebook friends” to be either 302, 502, 702, or 902. They theorize that it can hurt attractiveness to have too many friends. The least squares line issocialAtt = 5.039 + -0.111 * (friends/100)Question 13 (1 point)What notation should be used for the value 5.039?Question 13 options:?1Ë?1?0Ë?0Question 14 (1 point)On average, what does the regression line say happens when they add 100 friends?Question 14 options:Social attraction decreases by 5.039 unitsSocial attraction increases by 0.111 unitsSocial attraction increases by 5.039 unitsSocial attraction decreases by 0.111 unitsQuestion 15 (1 point)Predict the social attraction for someone with 502 Facebook friends.Question 15 options:4.482-0.53325.1855.595Question 16 (1 point)What is the scope of inference for this example?Question 16 options:More Facebook friends caused lower social attraction for the people in this study.More Facebook friends was associated with lower social attraction for all students at this university.More Facebook friends was associated with lower social attraction for the people in this study.More Facebook friends caused lower social attraction for all students at this university.Question 17 (1 point)What can you say about the correlation between Facebook friends and social attractiveness?Question 17 options:It must be positive.It must be 0.You cannot tell anything about the correlation between two variables without seeing the plot.It must be negative.