Question 15 1 pts (P1548) The points on a scatterplot of two variables has correlation equal to -1. The regression line is y=-3x+1. Average of variable x is -3. What can you tell about average of variable v. 0 Not enough information to exactly tell 0 it can be exactly calculated Question 16 1 pts What can you tell about the residuals O r: their SD is zero 0 all p,q,r are true 0 none of p,q,r are true 0 q: their median is zero 0 [3: their mean is zero Question 17 1 pts What can you tell about the slope a of the SD line. 0 a=0 0 Not enough information to tell Question 18 1 pts The point of averages of a scatterplot of Y against X is (-3, 10 J. The SD of X is 4, and the SD of Y is 12. The decimal fraction of points in the scatterplot whose X coordinates are between -11 and 5 and whoseY coordinates are between -20 and 40 is at least as. The largest possible value of 0: is o 0.59 O 1 o 0.75 O 0.34