Question

Tracey wants to study how often watering affects the growth of tomato plants. She plants three groups of five tomato plants. She waters the first group every day. She waters the second group every other day. She waters the third group once every three days. She also records the growth of the tomato plants weekly. Which option identifies the response variable of this experiment?

Option #1: the number of tomato plants in each group

Option #2: how often each group of tomato plants is watered

Option #3: the growth of tomato plants

Option #4: the amount of water per group for each watering

(1 point)
Option #

Answer 1

The response variable in an experiment is the variable that is measured to assess the effect of the independent variable (in this case, how often the plants are watered). In Tracey's experiment, she is interested in how watering frequency affects the growth of the tomato plants.

Therefore, the correct option that identifies the response variable of this experiment is:

**Option #3: the growth of tomato plants**