Monday, August 27th

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Monday, August 27th

• Six girls were running a race. When the winner
  crossed the finish line, the following conditions
  existed
• Bessie is 25 meters behind Rose.
• Rose is 15 meters ahead of Jean.
• Dottie is running beside Aileen.
• Jean is 30 meters behind Sara, who is 5 meters
  ahead of Aileen.
• List the order in which the girls were running
  when the winner crossed the finish line.

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Scientific Method
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Steps in the Scientific Method

• Question
• Observation
• Hypothesis
• Experiment
• Data Collection
• Conclusion
• Retest

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Question

• Must be testable.
• Should ask about real objects or situations.

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Observations

• Gathered with your senses
• A scientist notices something in their natural
  world

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Observations

• An example of an observation might be noticing
  that many salamanders near a pond have curved,
  not straight, tails

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Hypothesis

• A suggested solution to the problem.
• Predicts an outcome by answering the question.

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Hypothesis

• An example of a hypothesis might be that the
  salamanders have curved tails due to a pollutant
  in the moist soil where they live.

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Experiment

• A procedure to test the hypothesis.

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Scientific Experiments Follow Rules

• An experimenter changes one factor and observes
  or measures what happens.

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Variables

• The factor that I, the experimenter,
  controls/changes is the independent variable.
• The factor that is measured or observed is called
  the dependent variable.

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Example of Constants Variables

• For example, suppose you want to figure out the
  fastest route to walk home from school.
• You will try several different routes and time
  how long it takes you to get home by each one.
• Since you are only interested in finding a route
  that is fastest for you, you will do the walking
  yourself.

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What are the Variables in Your Experiment?

• Varying the route is the independent variable
• The time it takes is the dependent variable
• Keeping the same walker throughout makes the
  walker a constant.

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One more thing it is best to make several trials
during an experiment.
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Control Group and Experimental Group

• Control Group group that nothing happens to
  (provide an idea of what is normal)
• Experimental Group group that is subjected to
  experimental variables

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Data

• Results of the experiment
• May be quantitative (numbers) or qualitative

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Data

• Must be organized
• Can be organized into charts, tables, or graphs

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Conclusion

• The answer to the hypothesis based on the data
  obtained from the experiment

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Conclusion
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Retest

• In order to verify the results, experiments must
  be retested.

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Solving a Problem

• 1) Identify a Problem (Question)
• 2) State Observations about the problem
• 3) Form a Hypothesis about the problem (ifthen)
• 4) Design an Experiment to test the hypothesis
• 5) Collect Data
• 6) Form a Conclusion
• 7) Retest

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Scientific Method
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Tuesday, August 28th

• Read the following experiment and identify the
  independent and dependent variables.

Sue wants to determine which type of dog food
will help her dog lose the most weight. She sets
up an experiment in which she feeds her dog a
different food each week for three weeks. On
Monday, Wednesday, and Friday of each week she
weighs her dog.
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To Do List

• Complete Sample Lab Activity
• Get checked off when complete
• Experimental Design Worksheet
• Turn in to tray

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Looking at Sample Labs

• Work with your group to find the following
  information for each sample lab
• Independent Variable
• Dependent Variable
• Constants
• Conclusion

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Practice

• Experimental Design Worksheet
• Work individually on the worksheet
• Read carefully and use your notes!

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Graphs!

• Pie Graphs percents that add to 100
• Bar Graphs data in numbers and words
• Line Graphs data in numbers
• Scatter Plots data is plotted using X and Y axis

Complete the Graphing Skills Worksheet. Due
Wednesday!