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

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

    • Biology I Mr. Nettles
    • 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
    • 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”?
    • 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
    • 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.
    • 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.
    • Independent Variable
      • The independent or manipulating variable is the factor that is intentionally changed by the person doing the experiment.
    • Dependent Variable
      • The dependent or responding variable is the factor that may change because of changes made to the independent variable.
    • 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.
    • Critical Thinking
      • What two steps of the scientific method have we been focusing on today?
      • Answer: “Form a Hypothesis” and “Test your Hypothesis /Experiment”
    • 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.
      • PRACTICE
      • 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.
    • 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.
      • 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.
      • What is the problem?
      • What is your hypothesis?
      • What is the independent variable and dependent variable in this experiment?
      • What controls would be needed?
    • 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.
    • 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?