IV vs DV
In an experiment testing how sunlight affects plant growth, what is the independent variable?
Amount of sunlight
In an experiment, the “control group” is best described as:
The group that does not receive the experimental treatment
How many centimeters are in 1 meter?
100
Which is larger: 1,000 milligrams or 1 gram?
They are equal
If you test how temperature affects how fast sugar dissolves, what is the dependent variable?
Time (or rate) it takes for the sugar to dissolve
What is the term for variables that must be kept the same in every trial?
Constants
Convert 3 kilometers into meters.
3,000 meters
Convert 0.75 meters to centimeters.
75 centimeters
True or False: The dependent variable is what the experimenter changes/influences on purpose.
If you are testing how the type of surface affects how far a ball rolls, name one constant you would keep the same.
The ball, the push force, or the slope of the surface (any reasonable answer)
A runner completes 5,000 meters. How many kilometers is that?
5 kilometers
A fish tank holds 2.5 liters of water. How many milliliters is this?
2,500 milliliters
A scientist tests whether fertilizer makes plants grow taller. Identify both the IV and the DV.
IV = fertilizer use; DV = plant height
A student tests whether listening to music while studying improves test scores. What would be a reasonable control group?
A group that studies with no music
Convert 250 milliliters to liters.
0.25 liters
A person weighs 62.4 kilograms. How many grams is that?
62,400 grams
Why must an experiment only test one independent variable at a time?
To know what actually caused the change in the dependent variable
Explain why repeating an experiment is important in science.
To increase reliability and make sure results weren’t due to chance or error
A scientist measures a mass of 3.45 kilograms. How many grams is that?
3,450 grams
A recipe calls for 1.2 liters of milk, but you only have a measuring cup marked in milliliters. How many milliliters of milk do you need?
1,200 milliliters