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A researcher wants to determine the effectiveness of a new diabetes drug to control blood sugar levels.

The clinic where he will be conducting his research has $500\text{ patients}$ following a diet plan that was formulated to help control blood sugar levels. The researcher would like to use these $500\text{ patients}$ to determine what the effectiveness of $60\text{ mg}$, $80\text{ mg}$, and $100\text{ mg}$ pills would have on blood sugar levels.

Which of the following research designs would be the most appropriate?

A

A randomized block design by diet plan for the three levels of drug dosage.

B

A stratified random sample where the experimental design has four strata, one for each of the drug dosage levels and one placebo/control group.

C

A double-blind study with patients assigned randomly to one of four groups, one for each of the drug dosage levels and one placebo/control group.

D

A stratified random sample with no placebo/control group since there are already three groups that can be measured against one another.

E

A research design is only necessary when sample is conducted, so there is no need for an experimental design since the entire population of $500\text{ patients}$ at this clinic is being measured.

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