Experimental Variables
Presentation
•
Science
•
8th - 9th Grade
•
Practice Problem
•
Medium
+6
Standards-aligned
Aimee Tabrizi
Used 20+ times
FREE Resource
3 Slides • 6 Questions
1
L.E: Experimental Variables
IV, DV, Constants
2
Different Types of Variables
Independent Variable/IV: The variable you change between the setups (the thing you manipulate)
Dependent Variable/DV: The variable you are measuring/recording as data (the thing responding to the IV)
Constants: The variables that are the same in all setups
3
Cindy's Experiment
Cindy wants to know if hand sanitizer prevents mold from growing. She uses 2 pieces of white bread. She touches one piece with unclean hands and the other piece with sanitized hands. Then she puts each piece in a bag and leaves them on a window sill.
4
Open Ended
Considering her question, write a hypothesis that Cindy might be testing.
5
Multiple Choice
Cindy wants to know if hand sanitizer prevents mold from growing. She uses 2 pieces of white bread. She touches one piece with unclean hands and the other piece with sanitized hands. Then she puts each piece in a bag and leaves them on a window sill.
What is her independent variable?
the amount of mold that grows
whether or not sanitizer is used
what type of bread she used
the bread touched with unclean hands
6
Multiple Choice
Cindy wants to know if hand sanitizer prevents mold from growing. She uses 2 pieces of white bread. She touches one piece with unclean hands and the other piece with sanitized hands. Then she puts each piece in a bag and leaves them on a window sill.
What is her dependent variable?
the amount of mold that grows
whether or not sanitizer is used
what type of bread she used
the bread touched with unclean hands
7
Multiple Select
Cindy wants to know if hand sanitizer prevents mold from growing. She uses 2 pieces of white bread. She touches one piece with unclean hands and the other piece with sanitized hands. Then she puts each piece in a bag and leaves them on a window sill.
What were the constants in her experiment? (check all that apply)
same type of bread used
one was touched with sanitizer, one wasn't
both were placed in a baggie
both were placed on a window sill
8
Open Ended
Cindy wants to know if hand sanitizer prevents mold from growing. She uses 2 pieces of white bread. She touches one piece with unclean hands and the other piece with sanitized hands. Then she puts each piece in a bag and leaves them on a window sill.
Identify her control group
9
Open Ended
What data/results would support the claim that hand sanitizer does prevent mold from growing?
L.E: Experimental Variables
IV, DV, Constants
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