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Experimental Design
Test Description: Requires students to identify parts of an experiment and critique experiments
Instructions: Answer all questions to get your test result.
1) Why are repeated trials important?
A
To make sure errors in the experiment do not ruin overall data
B
To have a measurable DV
C
To make experiment longer
D
To make the experiment more challenging
2) How can you identify the Independent (Manipulated) variable?
A
It is measured or observed
B
It's effect is what's being tested
C
It's impossible
D
It stays the same throughout the experiment
3) Why is it important to control your variables?
A
All of these
B
So that you are confident that the only thing affecting the DV is the levels of IV
C
To get reliable data
D
To make sure no outside factors skew data
4) To test how different liquids affect plants, Bob sets up an experiment and uses all of the same species of plants, gives them all the same volume of liquid, and puts them in same environment. With this, what is Bob doing?
A
Controlling his variables
B
Completing repeated trials
C
Identifying the DV
D
Gathering supplies
5) In an experiment using human subjects, why is it important to have lots of people in the study?
A
To make the experiment more difficult
B
To have enough data to create an average that helps eliminate the effect of variation in humans
C
To have the others watch the trials
D
Because not many people will agree to be in the study
6) Mary wants to test how different fertilizers affect the volume of roots a rosebush grows. What is Mary's DV?
A
fertilizers
B
amount of fertilizer
C
temperature
D
root volume
7) To represent the volume of roots in her rosebushes over two weeks, what is the best graph for Mary to use?
A
scatter plot
B
line graph
C
pie chart
D
bar graph
8) Bob is testing the effect of different liquids on plant growth. Which of the following would you expect to be a level of his independent variable?
A
air
B
water
C
dirt
D
sunlight
9) What is the purpose of a control in an experiment?
A
There isn't one
B
It limits the number of independent variables
C
It mirrors the natural state and is used as a comparison for the experimental results
D
To make sure there is only 1 dependent variable
10) Which data would be best represented with a bar graph?
A
The change in mass of a dog throughout its lifetime
B
The increase in height of a boy throughout the year
C
How many 7th graders prefer each color of Starburst
D
The decline in bald eagle population after 1960
*select an answer for all questions
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