32 Jillian wants to know which type of antibiotic is most effective in killing a certain type of bacteria, so she performs the following
experiment
Jillian grows cultures of the bacteria on petri plates. Each plate is covered with the same number of bacterial colonies--100
colonies per plate
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Jillian then applies 1 mL of four different types of antibiotic to the different plates. The plates are incubated in the dark at the same
temperature and humidity for one week Jillian records the number of colonies that remain on each plate at the end of each day
during the week Her results appear below
Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7
Plate 1 100 90 80 70 60 50 40
Plate 2 100 87
69 55 43 43 43
Plate 3 100 95 110 125 150 138 104
Plate 4 100 50 37 16 0 0 0
What is the outcome vanable (dependent variable) in Jillian's experiment?
OA. the initial number of bacterial colonies
B. the number of bacterial colonies that remain
OC. the type of bacteria that is being tested
OD. the type of antibiotic that is used