PPT

1. Identifying Variables

2. Hypothesis Review…
• If Stephen thinks that energy drinks
will help him have more energy
all day long…
• Can you write a hypothesis for this scenario?
If…Then…Because
Scenario Outcome Reason why

3. Independent Variable
• What the scientist changes…what is being tested
• If Stephen drinks energy drinks instead of water
• Then he will have more energy
• Because energy drinks contain sugar and
caffeine.
• What is being tested or changed?

4. Independent Variable
• Stephen is testing….
ENERGY DRINKS

5. Dependent Variable
• What the independent variable changes…what is
measured
• If Stephen drinks energy drinks instead of water
• Then he will have more energy
• Because energy drinks contain sugar and
caffeine.
• What is the outcome?

6. Dependent Variable
• What is being measured?
HOW MUCH ENERGY STEPHEN
HAS!

7. Control Group or Constant
• What stays the same…
• For his experiment, Stephen wants to test
different energy drinks. For one week, he drinks
an 8 oz. can of a different energy drink each
morning.
• What stays the same despite the change in
energy drink?

8. Control Group or Constant
• What stays the same?
STEPHEN ALWAYS DRINKS 8 OZ. &
HE ALWAYS DRINKS IT IN THE
MORNING.

9. Let’s Try Some…
• Martin believes that lemon juice will keep apple
slices fresh longer. He puts 4 apple slices in a
bag with lemon juice and 4 apple slices in a bag
with no juice. He observes each bag until the
apples turn brown.
• What is the independent variable?
• What is the dependent variable?
• What is the constant (or control)?

10. How did you do?
• Independent Variable – lemon juice
• Dependent Variable – time it takes to turn
brown
• Constant (or Control) – 4 apple slices in a sealed
bag

11. Let’s Try Another One…
• Juan wants to see if new shoes will affect how
high he jumps. He measures how high he jumps
in his old shoes and then measures his jump
with his new shoes.
• What is the independent variable?
• What is the dependent variable?
• What is the constant (or control)?

12. How did you do?
• Independent Variable – shoe type
• Dependent Variable – height of his jump
• Constant (or Control) – wears shoes & where he
jumps

13. One More…
• Ceiona wants to see if diet soft drinks will freeze
faster than regular soft drinks. She pours 8 oz. of
each drink into a glass and places them in the
freezer. She checks the drinks every hour and
then records her findings.
• What is the independent variable?
• What is the dependent variable?
• What is the constant (or control)?

14. How did you do?
• Independent Variable – type of drink (diet or
regular)
• Dependent Variable – time till freezes
• Constant (or Control) – 8 oz. of soft drink, glass
cups, same freezer & freezer temperature