A dog trainer wants to find out whether praise helps a dog learn the "sit"
command more quickly. She randomly selects 40 dogs from the four training
classes she teaches. Then she randomly divides them into two groups of 20
dogs each.
The dogs in group A are given a treat and praised when they sit on command.
The dogs in group B are given a treat when they sit but are not praised. The
trainer compares how quickly the dogs in the two groups mastered the
command
What are the treatments in this experiment?
O A. Being one of the 40 dogs selected and not being one of the 40 dogs
selected
O B. Getting a peanut butter treat for sitting and getting a cheese treat
for sitting
C. Having had the trainer for a previous training class or not having had
the trainer for a previous training class
D. Being praised for sitting and not being praised for sitting