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Hypothesis and Variables

Hypothesis and Variables. 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! . Step 3: Form a Hypothesis.

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Hypothesis and Variables

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  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????

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