Science 7: 10/1/13

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*Study Unit Review for Test Tomorrow!*

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Scientific Method!

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Definitions Obs. / Inf. Control Exp.

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Row 1, Col 1

What is a problem?

Something that needs to be solved. Written in a TESTABLE QUESTION format!

1,2

What is an observation?

Information gathered with five senses

1,3

Write a possible hypothesis to answerthe following problem question:

What effect does sunlight have on plant growth?

1,4

What is the scientific method?

Steps used by scientists to carry out an experiment

2,1

What is a hypothesis?

An educated guess, written:

IF (you do this) THEN (this will happen statement)

2,2

What is an inference?

Statement to explain observation

2,3

Kylie designed an experiment to see if crest white strips really whiten teeth. Set-up:

50 people used crest white strips for a month and

50 people did not use crest white strips for amonth. At the end of her study she measured

how white their teeth were.

What is the independent variable?

Crest White Strips vs. No Crest White Strips

2,4

What three things do all good experimentshave in common?

Only test 1 variable, many trials, many test subjects

3,1

What is the difference betweenthe data section and the conclusion section

of the scientific method?

Data section organizes data in tables and charts. The conclusion section EXPLAINS the data!

3,2

Daily Double

3,3

Kylie designed an experiment to see if crest white strips really whiten teeth. Set-up:

50 people used crest white strips for a month and

50 people did not use crest white strips for amonth. At the end of her study she measured

how white their teeth were.

What is the dependent variable?

Measurement of how white test subjects teeth are

3,4

Why is it important to test only one independentvariable at a time?

So you know which variable had an effect!

4,1

Control Group: “normal group”

Experimental Group: “Guinea Pigs”

What is the difference between the control and experimental

groups?

5,2

Daily Double

4,3

Kylie designed an experiment to see if crest white strips really whiten teeth. Set-up:

50 people used crest white strips for a month and

50 people did not use crest white strips for amonth. At the end of her study she measured

how white their teeth were.

What is the control and experimental groups?

Control: People w/o crest white strips

Experimental: People with crest white strips

4,4

What do I mean when I say all good experimentshave a large sample size? What do I mean when

I say all good experiments have many trials?

Large Sample Size = Many Test Subjects

Many Trials = Repeat over and over again

5,1

Independent variable: I change ____ vs. ____

Dependent variable: Data Measured

Constants: Variables kept the same between control & experimental groups!

Define the following:Independent VariableDependent Variable

Constants

4,2

5,3

Kylie designed an experiment to see if crest white strips really whiten teeth. Set-up:

50 people used crest white strips for a month and

50 people did not use crest white strips for amonth. At the end of her study she measured

how white their teeth were.

What are the constants?

Same toothpaste, Same overall teeth condition,

Same frequency of brushing

5,4

List the 6 steps of the scientific method in orderand explain each step.

Problem, Research, Hypothesis, Experiment, Results, Conclusion