Jose wants to know if his ficus plant will be affected by using fertilizer. To test this problem, he grows one plant
using fertilizer in the soil and he grows a second plant without fertilizer in the soil. He puts both plants on the
windowsill where they can receive light everyday. He waters both plants regularly. The data that he collected is
shown below.
Number of
Days
Day 1
Day 2
Day 3
Day 4
Day 5
Plant 1
With
fertilizer
Growth
(mm)
5
6
7
8
9
Plant 2
Without
fertilizer
Growth
(mm)
5
5
5
4
4
a. What problem was Jose trying to figure out with his experiment?
If his ficus plant will be affected by using fertilizer.
b. What is Jose's control group?