Variables
Data
Control Groups
Hypotheses
Measurement
100
The variable the scientist changes
What is independent variable
100
What should be included at the top of every graph or data table?
A title
100
A student wants to test the effect of caffeine on the heart rate of fruit flies. She gives half of the flies caffeine in their water and half of them no caffeine. Which group is the control group?
No caffeine
100
Write a hypothesis for the question "What is the effect of caffeine on the heart rate of fruit flies?"
If I give fruit flies caffeine, then their heart rate will _____.
100
What measurement is shown in this picture? Be sure to use units!!
2.3cm OR 23mm
200
The variable that is measured or observed
The dependent variable
200
What do we call all of the measurements and observations collected in an experiment?
Data
200
A student wants to test the effect of listening to music on how well you are able to memorize a list of words. He has a group of students listening to music for one minute while looking at a list of words and another group listening to no music while looking at a list of words. Which is the control group?
The group not listening to any music
200
Write a hypothesis for the question: If I chew Wrigleys, Orbit, and Five gum, which one will have the longest lasting flavor?
If I chew Wrigleys, Orbit, and Five gum, then ______ will have the longest lasting flavor
200
What measurement is shown here? Be sure to include correct units!
24 mL
300
Problem: What is the effect of caffeine on the heart rate of people?
What is the independent variable?
Caffeine
300
What is happening to the boiling point as pressure increases?
Boiling point is increasing
300
A scientist wants to test the effect of Miracle grow on the amount of tomatoes a plant produces. They give 3 plants miracle gro and 3 plants just water. Which is the control group?
The plants with plain water
300
Write a hypothesis for the following:
What is the effect of listening to music on my ability to memorize 5 words?
If I listen to music then I will be able to memorize ____ words
300
What mass is being shown on this triple beam balance? Be sure to use unit!!
142g
400
Problem: How does the amount of air pressure in a basket ball affect the height that the ball will bounce?
What is the dependent variable?
The height the ball bounces
400
What is the independent variable in this experiment?
External Pressure
400
There is no control group shown here. What SHOULD be the control group that would be included in this experiment
A flower with plain water (no food color)
400
Write a hypothesis for the following:
What is the effect of stretching after exercise on the amount of injuries an athlete suffers
If athletes stretch after exercise, then they will experience ________ injuries
400
Convert 342 mg to grams
K h d b d c m
.342 g
500
Hypothesis: If I increase the amount of salt in the water, then the boiling point will decrease
What is the independent variable?
The amount of salt
500
What is the depedent variable in this experiment?
Boiling point
500
Homer thinks that lemon juice will remove the mildew from his shower. He tests this by spraying half of his shower with lemon juice and half with plain water.
Which side is the control group?
The side with plain water
500
Write a hypothesis for the problem:
Do muscle cells or bone cells have more mitochondria?
If I count the mitochondria in muscle cells and bone cells, then _______ cells will have more/less mitochondria
500
Convert 3642 meters to Km
K h d b d c m
3.642 km