Which of the following is a true statement about the design of this experiment?
A doctor wants to determine if a new medication for
cholesterol is more effective than the previous
medication. The doctor informed his patients of the new
medication and asked them if they would like to
participate in a drug trial to test the effectiveness of the
new cholesterol medicine compared to the current
medication. Twenty-five patients who were currently
taking medication for cholesterol volunteered and were
given the new medication. After two months, the patients'
cholesterol levels are checked.
This experiment will show the effectiveness of the
new cholesterol medicine
O Because a random sample was not used, the doctor
will not be able to determine the effectiveness of the
new medicine.
O Because the doctor did not have a different random
sample of patients take the original medication, the
effectiveness of the new medicine will not be able to
be determined.
O Because the doctor did not have a different random
sample of patients not take any medication, the
effectiveness of the new cholesterol medication will
not be able to be determined.