Adrug researcher decides to test a new arthritis pain medication for safety and effectiveness on a treatment group of 100 severely disabled arthritis sufferers in a hospital ward. everyone in the group is assigned a number. patients with an even number receive the drug. patients with an odd number receive a placebo.

which of the following principles of experimental design are being followed?

check all that apply.

a. replication
b. blindness
c. blocking
d. randomization
e. lurking