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A recent medical study reported that people who own pets have lower blood pressure than people...

A recent medical study reported that people who own pets have lower blood pressure than
people who do not own pets. This led some doctors to believe that pet ownership has
positive health benefits. However, more careful analysis of the data showed that the pet
owners in the study exercised more and smoked less than those who did not own pets. This
is an example of
A. the placebo effect.
B. confounding.
C. a double-blind experiment.
D. a completely randomized design.

Math   Statistics-And-Probability   
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