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thegingercoffee thegingercoffee
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6 years ago
An observational study:
 a. analyzes data already available
  b. makes it possible to rule out factors over which the researcher has no control for the observed effects
  c. examines individuals that have been selected by the researchers
  d. allows researchers to control for all extraneous factors
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lamaituyalamaituya
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6 years ago
This helped my grade so much Perfect
Harvinder
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Just got PERFECT on my quiz
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Helped a lot
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