Experimental Design
How many types of variables are there in a scientific experiment?
3
This variable is tested during an experiment.
Independent
A decameter is (greater than/less than/ equal to) a meter.
Greater than
How many meters are in 1 decameter?
10
How many centimeters are in one meter?
100
The variable that is measured during the experiment
Dependent variable
This variable stays the same throughout the entire experiment.
Controlled
1,500 mm is (greater than/less than/ equal to) 1.5 m.
Equal to
83.2 g = ? mg
83,200
10.87 km = ? m
10,870
The group that is changed during an experiment.
Experimental group
A student is researching the effect of study time on his classmates' Science test results. What is the dependent variable?
Science test results
76.3 L is (greater than/less than/ equal to) 7.63 dL.
Greater than
923 mg = ? hg
.00923
23.6 km = ? cm
2,360,000
A student counts 124 bacterial colonies on a petri dish. What type of data is this?
Quantitative data
A student thinks that listening to calm music before sleep helps you sleep longer. What is the independent variable?
Whether or not a person listens to calm music before sleeping
82.39 mm is (greater than/less than/ equal to) 8.239 dm.
Less than
729.2 mm = ? dam
.07292
738 dm = ? mm
73,800
A student is investigating the effect of sugar in a soccer player's diet on the amount of goals they score in a game. Describe the experiment's control group.
The experiment's control group would have the all of the same factors as the experimental group, including the amount of players, team, position, etc. This groups would consume an average amount of sugar.
A student tests the impact of adding fertilizer to soil on a plant's growth. List two controlled (constant) variables.
type of plant, type of soil, amount of water, amount of sunlight
0.0063 dag is (greater than/less than/ equal to) 63 cg.
Less than
0.0093 dag = ? mg
93
34,702 mL = ? hL
0.34702