The Big Four
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The Big Four

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The Big Four The Big Four Presentation Transcript

  • Experimental Design: The Big 4
  • IV DV Control Constants
  • IV
  • IV Independent variable
  • IV Independent variable Manipulated variable
  • IV Independent variable Manipulated variable the thing “i” change
  • IV Independent variable Manipulated variable the thing “i” change Example: type of fertilizer
  • IV in an experiment on the effectiveness of cleaners, brian used 4 different types of cleaner: bleach, windex, vinegar, and water.
  • IV in an experiment on the effectiveness of cleaners, brian used 4 different types of cleaner: bleach, windex, vinegar, and water.
  • DV
  • DV dependent variable
  • DV dependent variable Measured variable
  • DV dependent variable Measured variable The “response” to the change
  • DV dependent variable Measured variable The “response” to the change example: plant growth
  • DV in an experiment on the effectiveness of cleaners, brian Measured the percentage of residue remaining after each cleaner was applied.
  • DV in an experiment on the effectiveness of cleaners, brian Measured the percentage of residue remaining after each cleaner was applied.
  • Control
  • Control used for comparison
  • Control used for comparison usually the “most normal” test group
  • Control used for comparison usually the “most normal” test group may also be a degree of the iv with “lowest value”
  • control in an experiment on the effectiveness of cleaners, brian used 4 different types of cleaner: bleach, windex, vinegar, and water.
  • control in an experiment on the effectiveness of cleaners, brian used 4 different types of cleaner: bleach, windex, vinegar, and water.
  • constants
  • constants stay the same
  • constants stay the same prove the effectiveness of the iv
  • constants stay the same prove the effectiveness of the iv look for values that are held “constant” for each test group
  • constants 2 brian set up 4-2 in tiles. he labeled the tiles a,b,c, and d. Each tile was submersed in a 1:1 mixture of motor oil and tar for 30 sec. they were then allowed to dry for 24 hrs. brian then poured 50 ml of each cleaner on the appropriate tile and wiped the tile 1 time from top to bottom with a clean 4 in sponge.
  • constants 2 brian set up 4-2 in tiles. he labeled the tiles a,b,c, and d. Each tile was submersed in a 1:1 mixture of motor oil and tar for 30 sec. they were then allowed to dry for 24 hrs. brian then poured 50 ml of each cleaner on the appropriate tile and wiped the tile 1 time from top to bottom with a clean 4 in sponge.
  • #1 The responding variable in an experiment is the... independent variable dependent variable
  • #1 The responding variable in an experiment is the... independent variable dependent variable
  • #2 the test group that is used for comparison is the... control constant
  • #2 the test group that is used for comparison is the... control constant
  • #3 factors that are kept the same in an investigation... controls constants variables
  • #3 factors that are kept the same in an investigation... controls constants variables