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dug dug
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6 years ago
Dr. Smith noticed that during the summer, an ice-cream stand extended their hours. He also noticed that temperatures were higher and that people consumed more ice cream. The variable of hours the ice-cream stand was open is an example of
 
  a. the experimental method. c. cause and effect.
  b. the third-variable problem. d. the placebo effect.
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6 years ago
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