definitions ?. the dependent variable is the variable that is being measured in an experiment

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Page 1: Definitions ?. The dependent variable is the variable that is being measured in an experiment

Definitions?

Page 2: Definitions ?. The dependent variable is the variable that is being measured in an experiment

The dependent variable is the variable

that is being measured in an experiment.

Page 3: Definitions ?. The dependent variable is the variable that is being measured in an experiment

The independent variable is the variable

that is

that is being changed in an

experiment.

Page 4: Definitions ?. The dependent variable is the variable that is being measured in an experiment

Controlled variables are variables that are

variables that stay they same throughout an experiment.

Page 5: Definitions ?. The dependent variable is the variable that is being measured in an experiment

An experimental control is a

group of things in an experiment that is not exposed to the

independent variable.

Page 6: Definitions ?. The dependent variable is the variable that is being measured in an experiment

A Hypothesis should…

Have a prediction and a reason.

Be based on a scientific reason/ observation.

Never be thought of as _guess – only.

State both a prediction and a reason.

Page 7: Definitions ?. The dependent variable is the variable that is being measured in an experiment

Directions: For the following questions please,• Identify the dependent variable• Identify the independent variable• Pick 2 questions and write a hypothesis that

has a prediction AND a reason.

Page 8: Definitions ?. The dependent variable is the variable that is being measured in an experiment

Practice question 1:

• How does the amount of television watched affect attention?

Page 9: Definitions ?. The dependent variable is the variable that is being measured in an experiment

Practice question 2:

• How do carbon dioxide levels in the atmosphere affect global temperatures?

Page 10: Definitions ?. The dependent variable is the variable that is being measured in an experiment

Practice question 3:

• How do different brands of fertilizer affect pea plants growth?

Page 11: Definitions ?. The dependent variable is the variable that is being measured in an experiment

4. What brand of paper towel absorbs the most water?5. How does light intensity affect plant growth?6. How does the shape of an object affect the rate at

which it falls through water?7. How does slope angle affect speed?8. How does the weight of a bicycle affect coasting

speed?9. What type of rock is the most resistant to

weathering?10.How does the mass of a rock affect barnacle density?

Page 12: Definitions ?. The dependent variable is the variable that is being measured in an experiment

11. How do plants affect dissolved oxygen levels in an aquarium?12. How does the surface area of a paper airplane’s wings affect

flight distance?13. How does wind affect the distance different sized particles

(sand, gravel, rock) can travel?14. What place at AISG has the most bacteria? 15. Does environment determine the stem color of a fast plant?16. How does the length of a lever affect the force that must be

applied to lift an object?17. How does wind direction in Bellingham affect the temperature?18. How does camouflage affect the survival of a species?19. How is the rate of starch breakdown affected by different

people’s saliva?

Page 13: Definitions ?. The dependent variable is the variable that is being measured in an experiment

20. How does gender affect the average carapace size of a Dungeness crab?21. How do varying amounts of catnip affect cat behavior?22. What affect does salt placed on roadways to melt ice have on plants

living on the shoulder?23. Does what a chicken eats affect the level of cholesterol in its eggs?24. Does repetition increase the speed in which a mouse can navigate a

maze? 25. What affect does the color of light have on plant growth?26. How does the amount of fertilizer applied to a plant affect its growth?27. How does the size of a crab affect its speed?28. What type of mouthwash is most affective in killing mouth bacteria?

Page 14: Definitions ?. The dependent variable is the variable that is being measured in an experiment

How to write a scientific question…

Include both the independent and

dependent variables

Be written in a question format

Be based on an observation.

Page 15: Definitions ?. The dependent variable is the variable that is being measured in an experiment

Practice

• 1. Caffeine may affect your heart rate.

Page 16: Definitions ?. The dependent variable is the variable that is being measured in an experiment

Practice

• 2. Use of fertilizers may be causing frog mutations.

Page 17: Definitions ?. The dependent variable is the variable that is being measured in an experiment

Hypothesis practice

• Write a hypothesis for the question that you wrote about caffeine affecting heart rate.