Identify I + D
How does rainfall affect plant growth?
I: rainfall
D: Plant growth
In a practical, what type of variable stays the same throughout the experiment?
Control
I want to see the effect of light intensity on plant growth. What is the independent variable?
Light intensity
How does sunlight affect the behavior of animals?
I: sunlight
D: Animal behavior
What type of variable is manipulated in an experiment?
Independent
I want to see how the fluffiness of a bunny is affected by the amount of carrots it eats. What is the dependent variable?
Fluffiness
How does temperature affect the migration patterns of birds?
I: temperature
D: migration patterns
What type of variable is measured?
Dependent
Write a hypothesis for an experiment that is testing the effect of temperature on plant growth.
If you increase the temperature of a plant's environment, then the plant will grow faster up to a certain point because it will grow best at its optimum temperature and then decrease once the optimum temp passes
Students are conducting an experiment to determine the effect of different amounts of fertilizer on plant growth. They set up four groups of plants, each receiving a different amount of fertilizer (0g, 5g, 10g, and 15g). They measure the height of the plants after two weeks.
What is the independent variable and what is the dependent variable?
I: amount of fertilizer
D: height of plants
In an experiment to test how the amount of light affects oxygen production, which is the independent variable?
amount of light
Identify the independent and dependent variable in the following scenario:
If you sleep 8 hours a night, then you will be in a better mood because lack of sleep affects mood
I: amount of sleep
D: mood
Students are investigating the effect of different distractions on reaction time. They have participants complete a simple reaction time test (pressing a button when a light flashes) both with and without distractions (listening to loud music or complete silence).
What is the independent variable and what is the dependent variable?
I: w/ or w/o distractions
D: reaction time
What is the definition of a control variable?
The variables that stay the same throughout the experiment
Identify the independent, dependent, AND control variable in the following scenario:
The amount of pollution produced was measured for cars using gasoline containing different amounts of lead.
I: amount of lead
D: amount of pollution
C: Gasoline
Students are exploring how different intensities of exercise affect heart rate. They have participants perform three different exercises (walking, jogging, and sprinting) for 5 minutes each and measure their heart rate immediately after each exercise.
What is the independent variable and what is the dependent variable?
I: intensity of exercise
D: Heart rate
Identify 2 control variables you should have if you are testing how the temperature of water affects the amount of sugar that dissolves.
volume of water, type of sugar, same starting sugar amount
Identify the independent, dependent, AND variable in the following scenario:
If you brush your teeth for 2 minutes twice a day, then you will get less cavities compared to if you brush your teeth for 1 minute twice a day
I: amount of time
D: Amount of cavities
C: the amount of times per day