Computers and Technology, 02.09.2019 21:10 goly9453

Dr. rajah is studying the effects of a new drug on cognitive performance. after random assignment of
groups, one group takes the drug while the other takes a placebo. afterward, both groups do a series of
timed brain teasers and are scored on performance. dr. rajah finds a significant difference between the two
groups. does his experiment have external validity?

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Dr. rajah is studying the effects of a new drug on cognitive performance. after random assignment of...