Determine If the Following Scenario Is an Observational Study or a Controlled

question 48

Multiple Choice

Determine if the following scenario is an observational study or a controlled experiment. A doctor is interested in determining whether a certain medication increases the risk of high blood pressure. He randomly selects 100 people for his study - 50 who will take the medication, and 50 who will take a placebo. He checks the patients' blood pressures weekly for six months.

• A)Observational study
• B)Controlled experiment
• C)Neither

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Definitions:

Standard Stimulus

A specific environmental condition or stimuli that is consistently used throughout an experiment as a benchmark against which subjects' reactions or responses are measured.

Jnd

The just noticeable difference, the minimal change in stimulus intensity required to detect a difference between two stimuli.

Constant

A situation or state of affairs that remains unchanged over a period of time.

Psychophysics

The scientific study of the relationship between physical stimuli and the sensations and perceptions they produce.