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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 have a measurable DV
B
To make sure errors in the experiment do not ruin overall data
C
To make the experiment more challenging
D
To make experiment longer
2) How can you identify the Independent (Manipulated) variable?
A
It's impossible
B
It's effect is what's being tested
C
It stays the same throughout the experiment
D
It is measured or observed
3) Why is it important to control your variables?
A
To get reliable data
B
To make sure no outside factors skew data
C
So that you are confident that the only thing affecting the DV is the levels of IV
D
All of these
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
Gathering supplies
B
Identifying the DV
C
Completing repeated trials
D
Controlling his variables
5) In an experiment using human subjects, why is it important to have lots of people in the study?
A
To have enough data to create an average that helps eliminate the effect of variation in humans
B
To have the others watch the trials
C
To make the experiment more difficult
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
amount of fertilizer
B
fertilizers
C
root volume
D
temperature
7) To represent the volume of roots in her rosebushes over two weeks, what is the best graph for Mary to use?
A
line graph
B
scatter plot
C
bar graph
D
pie chart
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
water
B
sunlight
C
air
D
dirt
9) What is the purpose of a control in an experiment?
A
It limits the number of independent variables
B
It mirrors the natural state and is used as a comparison for the experimental results
C
To make sure there is only 1 dependent variable
D
There isn't one
10) Which data would be best represented with a bar graph?
A
The decline in bald eagle population after 1960
B
The increase in height of a boy throughout the year
C
The change in mass of a dog throughout its lifetime
D
How many 7th graders prefer each color of Starburst
*select an answer for all questions
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