A a dedicated scientist, Mr. Curiosa did not give up. He persevered with his efforts to demonstrate that he wad made a better, healthier dog food. He wanted to prove that his special formula worked. To test this, his son
brought home a Black Labrador puppy named Coal. Mr. Curiosa went to his local dog shelter and brought home
an adorable, Chihuahua puppy named Dirt. Thus began his second experiment.
Mr. Curiosa added his special vitamin mixture to some commercial dog food and labeled it 'A' Then he took
the same commercial dog food but this time he did not add any of his vitamins. He labeled this dog food 'B'.
Coal received food A and Dirt received food B.
For an entire year Mr. Curiosa made sure that each dog got their own food. He brought the dogs to his company
picnic and proudly showed them off. Coal, the black Labrador, had grown twice as big as Dirt who was a
Chihuahua.
"You think you made some fancy dog food, huh?" one friend said, "You can not prove that your special dog
food is better. Labradors always grow bigger than Chihuahuas! His larger size had nothing to do with your
fancy dog food." Mr. Curiosa realized that his friend was right. He had made a mistake in his second
experiment
Questions for Experiment # 2:
1.
Which one of the steps in the scientific method did Mr. Curiosa improve on in his second experiment?