Algebra- Researchers confuct a study...
Researchers conduct a study to compare different treatments for a respiratory condition. The treatments include taking a prescription pill daily, exercising with a coach daily, or receiving a placebo daily. The researchers inform the placebo group that they will likely not notice a change in their respiratory condition because the placebo does not have any active ingredients. Each group receives its treatment for a four-week period, during which the effects of each treatment are measured using both physical tests and laboratory evaluations.
This is an example of a(n) _[blank A]_. Its design _[blank B]_ yield bias because _[blank C]_.
Select three answer choices. Select the words or phrases that correctly fill in each of the blanks in the previous sentence.
blank A: observational study
blank A: experiment
blank A: sample survey
blank A: convenience survey
blank B: does not
blank B: does
blank C: the response variable is not fairly measured
blank C: researchers are measuring too many variables
blank C: researchers influence the responses
blank C: researchers do not influence the responses
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