Suppose you were to collect data for the pair of variables b
     Suppose you were to collect data for the pair of variables below. You  want to make a  which variable would you use as the explanatory variable and which as the response variable? Why would you expect to see in the   
  
  Solution
a. Based on the age of car we can determine the weight of the car
A is the answer
B. D is the answer. There is likely no association between the two variables.

