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Scientific method

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Scientific method

  1. 1. Scientific Method Chapter 1
  2. 2. What is the Scientific Method? Organized way to study a question or problem… 6 basic steps…
  3. 3. Step 1 1) Observe and state a problem … -ex) why do leaves change color in the fall months
  4. 4. Step 2 2) Form a hypothesis -testable explanation for an observation -ex) Maple leaves change color when air temperature drops -usually placed in an “If … then” format -ex) If the air temperature drops below 50 degrees, then leaves begin to change color.
  5. 5. Step 3 3) Test hypothesis – form an experiment Control Experiment – only one variable is changed at a time
  6. 6. Step 3 cont. Variable- factor that is tested, what “changes” Control group- NOT exposed to variable Experimental group- exposed to variable
  7. 7. Step 4 4) Record and analyze data Data is usually recorded in a organized manner, such as a table 2 Types of Data- -quantitative – “numbers” 4 feet tall, 5 leaves per branch -qualitative – “descriptive” green leaves, brown leaves
  8. 8. Step 4 cont. Data is then analyzed by graphing … 3 Types of graphs – -bar graph … used to compare groups -circle (pie) graph …used to show groups in relation to all, often % values -line graph …used to show “change” 2 or more variables
  9. 9. Characteristics of Graphs… Testing the Effects of a Change in TemperatureNumber of Leaves Change 30 25 20 Fall Color 15 Summer 10 5 0 Group
  10. 10. Steps 5 and 6 5) Form a conclusion -Does the data support the hypothesis? 6) Repeat (modify) Theory – unifying explanation for MANY observations, well supported hypothesis

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