Read about the following experiment and answer the three questions at the end.
Mr. Krabs created a secret ingredient for a breath mint that he thinks will “cure” the bad breath people get from eating Krabby Patties at the Krusty Krab. He asked 100 customers with a history of bad breath to try his new breath mint. He had fifty customers (Group A) eat a breath mint after they finished eating a Krabby Patty.
The other fifty (Group B) also received a breath mint after they finished the sandwich, however, it was just a regular breath mint and did not have the secret ingredient. Both groups were told that they were getting the breath mint that would cure their bad breath. Two hours after eating the Krabby Patties, thirty customers in Group A and ten customers in Group B reported having better breath than they normally had after eating crabby patties.
1. What is the independent variable?
2. What is the dependent variable?
3. What were some of the control variables?