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Do Now

Do Now. You have 5 minutes to answer the following question(s). When you are done take out your binder and turn to the notes section. What factors affect your ability to make an “A” in a class? What factors affect how fast a plant grows?. Announcements/ Expectations.

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Do Now

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  1. Do Now You have 5 minutes to answer the following question(s). When you are done take out your binder and turn to the notes section. • What factors affect your ability to make an “A” in a class? • What factors affect how fast a plant grows?

  2. Announcements/ Expectations • You will start seeing grades go in this weekend. • Headings • Prepared for class • Binder, divider and composition notebook • Class Points

  3. Variables and Hypothesis

  4. What is a variable? • Scientists use an experiment to search for cause and effect relationships in nature. • A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.

  5. Independent Variable • Also called the manipulated variable. • This is the variable that the scientist will manipulate to see how it affects the dependent variable. • The independent variable is the one that is changed by the scientist. • To insure a fair test, a good experiment has only one independent variable. • As the scientist changes the independent variable, he or she observes what happens.

  6. Dependent Variable • Also called the responding variable. • Are the result of something that the scientist has changed • Is actually being measured in the experiment • The scientist focuses his or her observations on the dependent variable to see how it responds to the change made to the independent variable.

  7. Controlled Variable • Also called the constant variable • The control variable will be the one that does not change. • Most experiments have more than one controlled variable. • The control variable is something that is constant and unchanged in an experiment.

  8. Form a Hypothesis Hypothesis: an educated guess or prediction; an “if, then” statement If independent/manipulated variable, then dependent/responding variable.

  9. Break

  10. Example • Mandy set up an experiment to show the relationship between plant growth and amount of water given to the plants. • The stated problem was "Does the amount of water affect the growth of bean seeds?” • Mandy's hypothesis was written in "if-then" format: • If I don't water my plants, then they will not grow. • Independent variable- Amount of water • Dependent variable- Plant growth

  11. Use this hypothesis to identify the variables If I leave all the lights on all day, then my electric bill will be high. IV: ______________________ DV: ______________________ If I drink Mountain Dew before bed, then I will not sleep very much. IV: ______________________ DV: ______________________ If I brush my cat more, then there will be less fur on my furniture IV: ______________________ DV: ______________________

  12. Now read the following experiment and identify the independent and dependent variables and write a hypothesis Elizabeth wanted to test if temperature affected how fast milk goes bad and curdles. She left milk in a room temperature closet, a fridge, and a oven that was turned on low heat. She then measured how rotten the milk was after 10 days. Hypothesis: ______________________________ IV: ____________________________________ DV: ____________________________________

  13. Independent Practice Worksheet Example Hypothesis:______________________________ IV: ____________________________________ DV: ____________________________________

  14. Independent Practice

  15. Exit Ticket What is an independent variable? What is a dependent variable? What is a hypothesis?

  16. ACT Prep

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