For each of the following pairs of variables, indicate whether you would expect a positive correlation, a negative correlation, or a correlation close to 0. Explain your choice
(a) price and weight of an apple
There is a positive correlation, because the cost of produce is determined by its weight, so a heavier apple would cost more.
There is a positive correlation, because the cost of produce is determined by its weight, so a heavier apple would cost less.
There is a negative correlation, because the cost of produce is determined by its weight, so a heavier apple would cost less.
There is a negative correlation, because the cost of produce is determined by its weight, so a heavier apple would cost more.
There is a correlation close to 0, because the cost of produce is not related to its weight, so there no reason to believe a heavier apple would cost more.
(b) a person's height and the number of pets he or she has
There is a positive correlation, because taller people have more pets.
There is a positive correlation, because taller people have fewer pets.
There is a negative correlation, because taller people have more pets.
There is a negative correlation, because taller people have fewer pets.
There is a correlation close to 0, because there is no reason to believe that the height of a person would be at all associated with the number of pets a person has.
