Question

experimental vs. observational
researchers want to know if adults who consume a drink that is high
in vitamin b - 12 have increased energy. they obtain a representative
sample of adults. all participants are given a drink that they are told to
consume every morning. they are not told what is in the drink. half
are given a drink that is high in vitamin b - 12 while the other half are
given a drink that tastes the same but contains no vitamin b - 12. which
group is the control group?
enter your answer

Explanation:

In an experiment, the control group is the one that does not receive the treatment (in this case, the drink high in vitamin B - 12). The group that is given the drink with no vitamin B - 12 serves as a baseline to compare against the group that gets the vitamin - rich drink.

Answer:

The group that is given a drink that tastes the same but contains no vitamin B - 12.