Distinguish Between an Observational Study and an Experiment

question 9

Multiple Choice

Distinguish Between an Observational Study and an Experiment
-A medical researcher obtains a sample of adults suffering from diabetes. She randomly assigns 52 people to a treatment group and 52 to a placebo group. The treatment group receives a medication over a period of three months and the placebo group receives a placebo over the same time frame. At the end of three months the patients symptoms are evaluated.

• A) experiment
• B) observational study

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Definitions:

Prostaglandins

A group of lipid compounds that are involved in various physiological processes, including inflammation and pain.

Ejaculation

The release of semen from the male reproductive system during sexual arousal.

Smooth Muscle

A type of muscle found in the walls of hollow organs, such as blood vessels and the digestive tract, that contracts involuntarily.

Urethra

The duct through which urine is discharged from the bladder to the outside of the body in both males and females and through which semen is discharged in males.