science 7: 10/1/13 ellen show: hawaii chair chromebooks: review games class jeopardy homework: as...
TRANSCRIPT
Science 7: 10/1/13
• Ellen Show: Hawaii Chair
• ChromeBooks: Review Games
• Class Jeopardy
• Homework: As Seen on TV lab due Thursday!
*Study Unit Review for Test Tomorrow!*
ChromeBooks:Remember Username is 8-characters
@shenschools.org
•Inky the Squid:
goo.gl/W9z0d4
•Walk the Plank:
goo.gl/1Kz1dU
100 100
200 200
400 400
300
400
Definitions Obs. / Inf. Control Exp.
Random
300 300 300
200
400
200
100
500 500 500 500
100
Row 1, Col 1
What is a problem?
Something that needs to be solved. Written in a TESTABLE QUESTION format!
1,3
Write a possible hypothesis to answerthe following problem question:
What effect does sunlight have on plant growth?
2,1
What is a hypothesis?
An educated guess, written:
IF (you do this) THEN (this will happen statement)
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!
3,3
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?
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
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