Hypothesis and Variables

1. Hypothesis and Variables

2. Step 3: Form a Hypothesis • Hypothesis- a testable explanation of an observation. • A hypothesis is NOT just an educated guess about what you think will happen. It must be able to be tested!

3. Step 3: Form a Hypothesis • We write the hypothesis in an If-Then statement ex: If the amount of fertilizer is increased, then the height of the plant will increase.

4. Variables & Controls • A variable is anything that changes in a scientific experiment. • The control is what you use to compare the results to in the end of the experiment.

5. There are 2 types of variables: • Independent • Dependent

6. Step 3: Form a Hypothesis • The Independent Variable goes after the “If” I.V. Ifthe amount of fertilizer is increased, then the height of the plant will increase.

7. Step 3: Form a Hypothesis • The Dependent Variable goes after the “Then” If the amount of fertilizer is increased, thenthe height of the plant will increase. D.V.

8. Now You Try: • If you spend more time studying, then your grade will improve. • Independent Variable = • Dependent Variable =

9. Now You Try: • If you spend more time studying, then your grade will improve. • Independent Variable = amount of time spent studying • Dependent Variable = grade

10. Now You Try: • If the temperature of the room is increased, then the bacteria will grow faster. • Independent Variable = • Dependent Variable =

11. Now You Try: • If the temperature of the room is increased, then the bacteria will grow faster. • Independent Variable = temperature of room • Dependent Variable = bacterial growth

12. Variables & Controls • A variable is anything that changes in a scientific experiment. • The control is what you use to compare the results to in the end of the experiment.

13. 2 Types of variables: • Independent Variable: What you change. • Dependent Variable: What changes because of the Independent Variable.

14. 2 Types of variables: • Independent Variable: Cause • Dependent Variable: Effect

15. Independent Variable • Independent Variable: What you change. • Cause • a.k.a Manipulated Variable • Graphed on x axis

16. Dependent Variable • Dependent Variable: What changes because of the Independent Variable. • Effect • a.k.a Responding Variable • Graphed on y axis

17. Independent Variable vs. Dependent Variable

18. After all of the data from the experiment is collected, then its time to organize the data.

19. Step 6: Organize your data • Put your data into a data table

20. Step 6: Organize your data • Make the data table into a graph • GRAPHS make it EASIER to see patterns in the data!

21. Step 6: Organize your data • How do you know what goes on each axis of the graph?

22. Step 6: Organize your data • DRY MIX • Dependent Variable = Responding Variable = Y axis • Manipulated Variable = Independent Variable = X axis

23. Parts of a graph Y Axis X Axis

24. Parts of a graph Y Axis (Dependent Variable) X Axis (Independent Variable)

25. Graphing: DRYMIX Dependent Variable Independent Variable

26. Any Questions????