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Q AA QQ5. When can you rule out the possibility that changes to variable X cause changes to variable Y? a. when there is no correlation between X and Y b. when there is a negative correlation between X and Y c. when a scatterplot of the two variables shows points lying in a straight line QQ6. What type of correlation would you expect between exercise and body mass index (a measure of how much body fat a person has relative to his or her height and weight)? a. none b. positive: more exercise would be consistently associated with higher body mass index c. negative: more exercise would be consistently associated with lower body mass index 404