Finding the Control Group
Variables
More Variables!
Change or Not to Change?
Steps of Scientific Method
100
Part of the experiment you are not testing, it is only used as a comparison?
the control
100
The one thing that is tested or changes on purpose in the experiment.
independent variable.
100
This is the variable that you will measure, or the results you get
dependent variable.
100
The variables that are kept the same in the experiment so the results are reliable.
constant
100
The first step of the scientific method.
ask a question/problem
200
You decide you want to compare which music makes you fall asleep faster. Week 1 you listen to rock music. Week 2 you listen to country music. Week 3 you listen to classical music. Week 4 you listen to no music. What is the control?
week 4
200
Is the size of fish affected by the depth of the ocean they live? What would be the IV?
depth of ocean.
200
A group of scientists test the idea that women find men without earrings more attractive than men with earrings. What is the IV?
men wearing earrings or not
200
You are testing if different amount of light affect plant growth. What constants will make the experiment valid?
soil, fertilizer, type of plants, amount of water, time of test
200
What is a testable statement called?
hypothesis.
300
Bart believes that mice exposed to radio waves will become extra strong. He has two groups of ten mice. He places group A near a radio for 5 hours. Group B that had not been exposed to radio waves. To test the hypothesis he placed a wood block to block the door to the mice food. After 5 hours he found that 8 out of 10 of Group A mice were able to push the block away. 7 out of 10 of Group B mice were able to do the same.
What is group B
300
Does temperature effect the number of chirps a cricket makes? What would be the DV?
# of chirps
300
Children who entered kindergarten at age 5 were compared with children who entered kindergarten at age 6. Tests were given to both groups in grade 5. Results indicate that children who entered kindergarten at age 6 scored higher on standardized tests than those kids that entered at age 5. What is the DV?
score on standardized test.
300
You want to see if students do better on a test if they study with music. You divide up one class into 2 groups of 15 students. Group A listens to music while studying their notes for 1 hour a night. Group B studies their notes with no music for 1 hour a night. After two weeks, a test was given to all students. What should the constants be to get reliable results?
two week time frame, 1 hour a night, 2 groups of 15 students, same test
300
The part of the scientific method that states whether the hypothesis is supported or not.
the conclusion.
400
Pea plant clones are giving different amounts of water for three-week period. The first pea plant receives 400 milliliters a day. The second pea plant receives 200 milliliters a day. The third pea plant receives 100 milliliters a day. The fourth pea plant does not receive any extra water: the plant only receives natural ways of receiving water. The heights of the pea plants are recorded daily. What is the control?
the pea plant with no water.
400
Does spending time with a pet decreases the amount of stress right before taking a test. What is the dependent variable??
amount of stress.
400
A researcher wants to investigate the types of social behavior that develops in children in day care depending on the amount of time the child spend in day care. What is the DV?
What is social behavior in children.
400
One tank of gold fish is fed the normal amount of food once a day. A second tank is fed twice a day. A third tank is fed four times a day during a six week study. The fish’s weight is recorded daily. What is the control?
The fish fed the normal amount of food
400
Used to visually display the data and communicate the results of the experiment
a graph
500
Why do scientists repeat the experiments multiple times?
to get reliable results or good data
500
Students at a University were split into two groups and each received a different text for a philosophy course. Once group received a traditional text book, while the other received an interactive textbook on a tablet computer. After the course, the final exam marks between the two groups of students was compared. What is the IV? DV?
IV=type of textbook. DV= grade
500
Three redwood trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. The heights of the trees are measured once a week. IV ? DV ? Control ?
What is IV-different humidity levels DV-Height of redwood tree CG-Tree kept outside
500
In order for a experiment to be valid and develop creditable data what do scientists need to do?
have constants have a control only test one variable repeat experiment
500
What should a scientist do if they do not answer the problem they were trying to solve in the experiment?
form a new hypothesis
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