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Research Designs: Diabetes Drug

APSTAT-LYDFFE

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 $500$ patients following a diet plan that was formulated to help control blood sugar levels. The researcher would like to use these $500$ patients to determine what the effectiveness of $60$ mg, $80$ mg, and $100$ 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 patients at this clinic is being measured.