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Target 5: Identify the control and experimental groups in an experiment.

Target 5: Identify the control and experimental groups in an experiment. The Control Group. G ets no experimental treatment or independent variable Controls are NOT being tested Controls are used for COMPARISON All experiments must have a control group. Experimental group.

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Target 5: Identify the control and experimental groups in an experiment.

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  1. Target 5: Identify the control and experimental groups in an experiment.

  2. The Control Group • Gets no experimental treatment or independent variable • Controls are NOT being tested • Controls are used for COMPARISON • All experiments must have a control group.

  3. Experimental group • Receives some condition of the independent variable.

  4. Example: Control vs. Experimental Groups • Mr. Smithersthinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of papers). • Group A is given the special juice to drink while they work. Group B is not given the special juice. After an hour, Mr. Smitherscounts how many stacks of papers each group has made. Group A made 1,587 stacks, Group B made 2,113 stacks. Identify: Control Group – Experimental Group – Independent Variable – Dependent Variable --

  5. Answer: • Control Group Group B • Experimental Group Group A • Independent Variable Special Juice • Dependent Variable Number of Stacks

  6. Target 6: Create a graph that shows the trends in the data with all the appropriate labels.

  7. Examples of Good and Bad Graphs Which graph is the “good” graph? Why? Graph 1 Graph 2

  8. What is wrong with this graph? • There's no title.  What's it a graph of?  Who knows? • There are no labels on the x or y axis.  What are those numbers?  What are the variables? Who knows? • There are no units on the x or y axis.  Is this a graph of speed in miles per hour or a graph of temperature? • Somebody played "connect the dots".  This should be a nice straight line which goes through the points or a curve that tends to follow them. Shows the TRENDS!

  9. Target 7: Write a Conclusion • Statement should accept or reject the hypothesis. • Should make recommendations for further study and possible improvements to the procedure.

  10. Conclusion Example: • Mr. Smithersneeds further testing of his hypothesis. The special juice does not increase the productivity of the workers in this experiment. However, this could be due to an inconsistency in the experiment. Another experiment will be run. Group A will be givenspecial juice one hour before the activityand group B will be given the same amount of water one hour before the activity. With this change in procedure the hypothesis will be tested again and data will be recorded.

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