Experimental Design Retest
Name___________________
Directions: On a sheet of paper, answer each of the following questions. You
do not need to write the questions—only the answers.
1) What is the correct order of the steps in the scientific method?
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2) The __________________________ is the variable that is being tested.
It is the CAUSE.
3) What is the slope of a line containing the points (-4, -5) and (0, -1)?
Show all work!
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4) Which variable is always plotted on the x-axis?
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5) Karissa was trying to figure out why her computer would not turn on. She
first tried pushing the power button a couple of times. Then she tried
pugging in the power cord and then trying to turn it on. She even tried
leaving it plugged in for ten minutes and then unplugging it before trying
to turn it on. What part of the scientific method is Karissa demonstrating?
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6) During an experiment, Jessi measured the height of her plants once per
week testing the effect of salt water on the plant. Varying the amount of
the salt water to the tested group of plants is the ______________
variable.
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7) Which variable is always plotted on the y-axis?
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8) In the equation y = 3x - 5, what is the slope of the line?
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9) What would the equation of the line that crosses the y-axis at (0,-9) and
has a slope of -7?
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10) Damian is testing the effects of LED lighting verses the normally used
fluorescent lighting on goldfish in aquariums. Which of the following
would best serve as a control group for his study?
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11) Would the point (6, -2) sit on the line y = x + 3? Show all work and be
sure to write “yes” or “no”.
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12) What part of the scientific method involves testing to see if your
hypothesis is correct?
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13) Looking for trends in the information collected during an experiment is
what part of the scientific method?
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14) In order for a hypothesis to be a true hypothesis, it must be both
__________ and __________.
.
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15) In the following experiment, what is the control?
Sponge Bob notices that his pal Gary is suffering from slimotosis, which
occurs when the shell develops a nasty slime and gives off a horrible
odor. His friend Patrick tells him that rubbing seaweed on the shell is
the perfect cure. Sponge Bob decides to test this cure by rubbing half of
Gary's shell with seaweed for 1 week. After a week of treatment, the
slime is gone from the half that was rubbed with the seaweed and
Gary’s shell smells better.
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16) What is the independent variable in the following situation?
Larry was told that a certain muscle cream was the newest best thing
on the market and claims to double a person’s muscle power when used
as part of a muscle-building workout. Interested in this product, he buys
the special muscle cream and recruits Patrick and SpongeBob to help
him with an experiment. Larry develops a special marshmallow weightlifting program for Patrick and SpongeBob. He meets with them once
every day for a period of 2 weeks and keeps track of their results.
Before each session Patrick’s arms and back are lathered in the muscle
cream, while Sponge Bob’s arms and back are lathered with the regular
lotion. Arm and back measurements were taken.
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17) In the following situation, what is the dependent variable?
A consumer advocate group wants to test whether a fertilizer company’s
claim that plants grow taller with their fertilizer is accurate. They
perform the following experiment: Forty coleus plants are grown from
clippings of a single plant. All of the plants are approximately the same
height at the start of the experiment. Twenty of the plants receive the
recommended amount of fertilizer with each watering. The remaining
twenty plants receive the same amount of water with no fertilizer. All
forty plants are grown at 25 ˚C with 10 hours of light daily. The height
of each plant is recorded every 5 days for 2 months.
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18) In the following situation, the underlined portion is the __________
variable.
In a recent study, middle school students were given a math
exam after various amounts of sleep. One group slept 8 hours
or more, and the second group slept fewer than 8 hours. The
students had similar skills in math. They ate the same meals
the previous day. The study results showed that students who
slept 8 hours or more scored better on the exam, while students
who slept less than 8 hours scored worse.
19) In the following graph, what is the independent variable?
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20) In the following graph, what is the dependent variable?