Savanah0818r Savanah0818r
  • 16-09-2017
  • Physics
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What the only type of investigation that involves a control group?

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Аноним Аноним
  • 16-09-2017
the answer is experimental. Thats the only investigation that involves a control group. 

hope this helps
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axaila axaila
  • 16-09-2017
Experimental Investigation for Placebo Effect
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