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WorksheetsExperimental Design and Variables Review
Total questions: 65
Worksheet time: 1hrs 1mins
What is the DEPENDENT variable (effect) in this experiment?
"Does eating breakfast improve test scores?"
eating breakfast or not
the grade you got on the test
what time you get up in the morning
how tasty the breakfast is
You are testing how the amount you water a plant affects its growth. What would be the INDEPENDENT VARIABLE in this experiment.
They type of pot you put the plants in.
The amount you water each plant.
The amount of sunlight the plants get.
The amount the plant grows.
Mr. Pransky wants to see how different surfaces affect how high a tennis ball can bounce. What is the independent variable?
the different surfaces
using the same ball
how high they bounce
A student wants to test the hypothesis of "If salt is added to water then the boiling point of water will decrease (go down)." What is the independent variable?
Whether salt is added or not
Boiling Point
Amount of water
If you were testing the time it took for objects of different sizes to reach the ground after being dropped from 30 feet in the air, which of these would be the DEPENDENT VARIABLE?
The time it takes for each object to hit the ground.
The size of each object.
The type of object you use.
The height you drop the object from
Sadie is testing how the age of a seed affects how fast plants grow. Look at the picture to see if you can figure out what makes her experiment unfair. Mark all that apply.
She used different types of seeds/plants.
The plants are in different pots.
She did not plant very many plants.
Seed age might not make a difference.
Steve wanted to see if the type of fertilizer made sunflowers grow larger. What is the independent variable?
A student performed an experiment that tested how many days it takes different types of grass seed to grow to a height of two inches. Four types of grass seed were tested, and the student recorded the number of days for each type to grow. Use this information to answer the next question.
What are the controlled variables in this experiment?
amount of sunlight, amount of water, and type of soil
amount of sunlight
amount of water and type of soil
amount of water
A scientist is testing which flavor of ice cream melts the fastest. What would his controlled variables be? (choose ALL that apply)
The flavor of ice cream
the kind of cone the ice creams are in
the place in the room where the ice cream is
the size of the scoop
the time it takes to melt
These are the variables that should stay the same. They do not get any changes in order to make for a fair test.
Dependent Variables
Controlled variables
Independent Variables
A student wants to test the hypothesis of "If salt is added to water then the boiling point of water will decrease (go down)." What is the independent variable?
Whether salt is added or not
Boiling Point
Amount of water
In any experiment, the independent variable ______________.
remains the same to not mess up the experiment
is purposely changed to test the hypothesis
is known by the scientist before doing the experiment
The variables in an experiment that stay the same are the ?
Independent Variables
Dependent Variables
Controlled Variables
We don't keep variables the same
What was the independent variable?
The two Groups in a controlled experiment are?
Control Group
Experimental Group (Test)
Independent Variable
Dependent Variable
A custodian notices some dirty tables and wants to know which cleaner is the best to use. He tests three different cleaners and looks at how well they clean compared to tap water. What is the control group?
type of cleaner
tap water
Surface cleaned
Steve wanted to see if different types of fertilizer influence sunflower growth. What is the control group?
type of fertilizer
sunflower grown without fertilizer
What part of an experiment contains the data tables and graphs?
Analysis
Conclusion
Hypothesis
Materials
A summary of the experiment that includes whether hypothesis was supported or not.
Hypothesis
Results
Conclusion
Independent Variable
What is the affect of salt water on the the height of blades of grass?
The above question is an example of:
Hypothesis
Conclusion
Procedures
Testable Question
What is the affect of salt water on the the height of blades of grass?
What is the independent variable in the above question?
salt water
height
average
affect
What are the number of times each level of the independent variable is tested?
constants
control
trials
dependent variable
What was the Independent Variable?
Students wanted to see if the type of material affected the temperature after being placed under a heat lamp for 10 minutes.
What is the dependent variable for this investigation?
Type of material (rocks, sand etc)
Temperature after 10 minutes
Time under the lamp
Heat lamp, amount of material
This is an example of
What is the IV?
Independent variable
Dependent variable
Conclusion
Maya designed an experiment to answer the following question:
How does the amount of water given to a lima
bean seed affect how tall it grows?
In this experiment, what variable should Maya CHANGE?
the amount of water
the kind of plant
the type of soil
the amount of sunlight it gets
Esther became interested in insulation while her parent’s new house was being built. She decided to determine which insulation transferred the least heat. She filled each of 5 jars half-full with water.
She sealed each jar with a plastic lid.Then she wrapped each jar with a different kind of insulation. She put the jars outside in the direct sunlight. Later, she measured the temperature of the water in each jar. What is the independent variable?
The type of insulation
The temperature of the water
Number of houses
The amount of sunlight
Why is the placebo effect used?
To compare results between the real medicine and placebo
To make new medicine
To train doctors
To make food
only 1
The type of variable that responds to the experiment and is what you measure or count to determine if your hypothesis is true.
Thomas tests different types of liquids to see which will grow his plants the most. He has water, soda, milk, and no liquid at all. What is the control group?
the one with water
the one with soda
the one with milk
the one with no liquid
Cindy wanted to find out how the amount of sunlight affects the growth of plants. She placed a tomato plant in 6 identical 10 inch pots with the same amount and type potting soil. She watered them ¼ cup each day. 3 plants were placed under a cardboard box and 3 plants were placed in the sunlight. She measured the growth of the plant each week for three weeks.
What is the dependent variable?
Using the same type of plant
Each plant was placed in a 10 inch pot
The growth of the plant
3 plants in the sunlight and 3 plants under a box
A scientist hypothesizes that the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The independent variable is
Erin is testing to see how different amounts of nitrogen infused in the soil will impact the height of her corn plants. She puts two corn plants into two pots. One is filled with nitrogen infused soil and the other is not. She puts the regular soil pot outside and the nitrogen infused plant in her bathroom. The corn in the regular soil grows to 7 feet tall and the corn in the nitrogen soil grows to 2 feet tall.
What is the dependent variable?
The regular soil
The nitrogen infused soil
The height of the plants
The plant in the bathroom
Using the picture, identify the control group.
Trial 1
Trial 2
Trial 3
What makes a good scientific question?
The question can be answered by yes or no.
The question can be answered by doing an experiment.
The question can be answered through extended thought.
Cindy wanted to find out how the amount of sunlight affects the growth of plants. She placed a tomato plant in 6 identical 10 inch pots with the same amount and type potting soil. She watered them ¼ cup each day. 3 plants were placed under a cardboard box and 3 plants were placed in the sunlight. She measured the growth of the plant each week for three weeks.
What is the independent variable?
Using the same type of plant
Each plant was placed in a 10 inch pot
The growth of the plant
3 plants in the sunlight and 3 plants under a box
procedure or test
