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Aug. 17 2011 (scientific method)
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Aug. 17 2011 (scientific method)


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  • 1. Biology I Mr. Nettles
  • 2. Agenda- Wednesday, August 17, 2011
    • 1. Warm Up – 5 min
    • 2. Daily Lesson – 25 min
    • 3. Wrap Up – 5 min
    • 4. Homework/Practice – 25 min
  • 3. Warm-Up
    • Write one quantitative and one qualitative observation about yourself.
    • Which step of the scientific method involves making table and graphs?
    • Which three steps of the scientific method come after “Making Observations”?
  • 4. Today’s Objectives
    • I will understand the steps involved in the scientific method.
    • I will understand the parts of an experiment or scientific investigation.
    • I will understand the meanings of control, hypothesis, independent variable, and dependent variable
  • 5. Hypothesis
    • The hypothesis is an educated guess about the relationship between the independent and dependent variables.
    • A hypothesis is usually written as an IF/THEN statement.
  • 6. What is Variable?
    • A VARIABLE is a factor in an experiment that can change.
    • There are two types of variables in an experiment: INDEPENDENT variable and the DEPENDENT variable.
  • 7. Independent Variable
    • The independent or manipulating variable is the factor that is intentionally changed by the person doing the experiment.
  • 8. Dependent Variable
    • The dependent or responding variable is the factor that may change because of changes made to the independent variable.
  • 9. Controls or Constants
    • CONTROLS or CONSTANTS are factors that scientists purposely keep the SAME in an experiment.
    • The purpose of a control is to ELIMINATE OUTSIDE FACTORS that may throw off the experiment.
  • 10. Critical Thinking
    • What two steps of the scientific method have we been focusing on today?
    • Answer: “Form a Hypothesis” and “Test your Hypothesis /Experiment”
  • 11. Quick Exercise:
    • Write a hypothesis about your grade in this class using an if/then statement.
    • Example: If I study an hour every night, then I will get an 80% or higher on all Unit Assessments.
  • 12.
  • 13.
    • Situation: Juan is trying to grow plants.
    • Problem: Will Juan’s plants grow better if he puts them in the sun?
    • Hypothesis: If Juan puts his plants in the sun, then they will grow better.
  • 14. What is the purpose of a control?
    • A control functions to make sure that everyone follows the directions of an experiment.
    • A control functions to eliminate the effect of outside variables on an experiment.
    • A control functions to increase variability in an experiment.
    • A control functions to manage the outcome of an experiment.
  • 15.
    • Michael wants to know if mice like to eat cheese or peanut butter.
    • He gets 6 white mice that are similar in size and age.
    • He places one mouse at a time in the center of a large cage.
    • At one end of the cage is a small plate filled with peanut butter and at the opposite end of the cage is a small plate filled with cheese.
    • Michael observes each mouse for 15 minutes and records the data.
  • 16.
    • What is the problem?
    • What is your hypothesis?
    • What is the independent variable and dependent variable in this experiment?
    • What controls would be needed?
  • 17. Controls needed:
    • Make sure mice are getting the same amount of water, light, heat, amount of cheese, color of cheese, different colored mice, different size cages, etc.
  • 18. Wrap-Up
    • What is a hypothesis and what type of statement is it usually written as?
    • What is the purpose of a control?
    • In your own words, explain what independent variable and dependent variable mean?