- whether the situation is an example of an experiment or an observational
study. Explain.
A nutritionist wants to know if taking vitamins keeps people from getting colds. She
gives 100 people a vitamin supplement for 2 months, and compares the results to
100 people who do not take vitamins.
3
1
a) This is an experiment. The nutritionist is applying a treatment (taking
vitamins) instead of simply gathering data.
b)
This is an observational study. The nutritionist is applying a treatment (taking
vitamins) instead of simply gathering data.
c)
This is an observational study. The nutritionist gathers data instead of
applying a treatment.
4
d)
This is an experiment. The nutritionist gathers data instead of applying a
treatment.