Marcy is doing an experiment on the effect of fertilizer on plant growth. She grows 30 pots of radishes. 10 pots receive fertilizer A, 10 pots receive fertilizer B, and 10 pots receive no fertilizer. She grows all the pots in the same location and gives them the same amount of water.
a. controlled variables, dependent variables, independent variables
: fertilizer
b. controlled variables, dependent variables, independent variables
: plant growth
c. controlled variables, dependent variables, independent variables
: growing in same location, water, type of plant (radish)
a. controlled variable: type of fertilizer (A, B, or none)
dependent variable: plant growth
independent variable: type of fertilizer (A, B, or none)
b. controlled variables: type of plant (radish), same location, amount of water
dependent variable: plant growth
independent variable: none
c. controlled variables: type of fertilizer (A, B, or none), amount of water
dependent variable: plant growth
independent variable: growing in the same location
Joey wants to see how the amount of TV watching affects grades. He surveys 100 high school students about the number of hours they watch TV during the week and also their grades. He makes sure that all the students he surveys are freshmen and go to the same class.
a. controlled variables, dependent variables, independent variables
: amount of TV watching
b. controlled variables, dependent variables, independent variables
: grades
c. controlled variables, dependent variables, independent variables
: students who are freshmen and go to the same class
a. controlled variable: students who are freshmen and go to the same class
dependent variable: grades
independent variable: amount of TV watching
b. controlled variables: students who are freshmen and go to the same class
dependent variable: amount of TV watching
independent variable: grades
c. controlled variable: grades
dependent variable: amount of TV watching
independent variables: students who are freshmen and go to the same class
a. The independent variable is the type of fertilizer (A, B, or none).
The dependent variable is the plant growth.
b. The controlled variables are the growing location and the amount of water given to each pot.
c. The controlled variables are growing in the same location, providing the same amount of water, and using the same type of plant (radish).