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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,
an...
IV
in an experiment on the
effectiveness of cleaners, brian
used 4 different types of
cleaner: bleach, windex, vinegar,
an...
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
cleane...
DV
in an experiment on the
effectiveness of cleaners, brian
Measured the percentage of
residue remaining after each
cleane...
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, vinega...
control
in an experiment on the
effectiveness of cleaners, brian
used 4 different types of
cleaner: bleach, windex, vinega...
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 ...
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 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
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The Big Four

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Transcript of "The Big Four"

  1. 1. Experimental Design: The Big 4
  2. 2. IV DV Control Constants
  3. 3. IV
  4. 4. IV Independent variable
  5. 5. IV Independent variable Manipulated variable
  6. 6. IV Independent variable Manipulated variable the thing “i” change
  7. 7. IV Independent variable Manipulated variable the thing “i” change Example: type of fertilizer
  8. 8. IV in an experiment on the effectiveness of cleaners, brian used 4 different types of cleaner: bleach, windex, vinegar, and water.
  9. 9. IV in an experiment on the effectiveness of cleaners, brian used 4 different types of cleaner: bleach, windex, vinegar, and water.
  10. 10. DV
  11. 11. DV dependent variable
  12. 12. DV dependent variable Measured variable
  13. 13. DV dependent variable Measured variable The “response” to the change
  14. 14. DV dependent variable Measured variable The “response” to the change example: plant growth
  15. 15. DV in an experiment on the effectiveness of cleaners, brian Measured the percentage of residue remaining after each cleaner was applied.
  16. 16. DV in an experiment on the effectiveness of cleaners, brian Measured the percentage of residue remaining after each cleaner was applied.
  17. 17. Control
  18. 18. Control used for comparison
  19. 19. Control used for comparison usually the “most normal” test group
  20. 20. Control used for comparison usually the “most normal” test group may also be a degree of the iv with “lowest value”
  21. 21. control in an experiment on the effectiveness of cleaners, brian used 4 different types of cleaner: bleach, windex, vinegar, and water.
  22. 22. control in an experiment on the effectiveness of cleaners, brian used 4 different types of cleaner: bleach, windex, vinegar, and water.
  23. 23. constants
  24. 24. constants stay the same
  25. 25. constants stay the same prove the effectiveness of the iv
  26. 26. constants stay the same prove the effectiveness of the iv look for values that are held “constant” for each test group
  27. 27. 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.
  28. 28. 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.
  29. 29. #1 The responding variable in an experiment is the... independent variable dependent variable
  30. 30. #1 The responding variable in an experiment is the... independent variable dependent variable
  31. 31. #2 the test group that is used for comparison is the... control constant
  32. 32. #2 the test group that is used for comparison is the... control constant
  33. 33. #3 factors that are kept the same in an investigation... controls constants variables
  34. 34. #3 factors that are kept the same in an investigation... controls constants variables
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