At the beginning of each month, a veterinarian recorded the mass of a cat in the table seen below. When the cat was 4 months old, he began to feed it a "special" kitten food which he had seen advertised on TV.
11. All of the following statements about the veterinarian's special cat food study are true except one. Which statement is not true?
a) The study used the metric system.
b) The veterinarian recorded data.
c) The veterinarian collected quantitative data.
d) The data could be graphed.
e) The veterinarian conducted a controlled experiment.
