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A Psychologist Is Interested Looking at the Effectiveness of a New

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A psychologist is interested looking at the effectiveness of a new computer program in helping students learn math. She decides to test this new program with a group of middle school students. At this particular school, the boys and girls tend to be disruptive when they are in the same classroom, so she decides to run them in separate groups in the experiment. She creates a group of boys, each of them using the computer program four times per week. She creates a group of girls to serve as a comparison group and they do not get the computer program. This experimental design is flawed because gender is a confounding variable and as a result the following has been lowered

Definitions:

Raynaud Phenomenon

A condition characterized by constriction of the small blood vessels in extremities, leading to color changes, pain, numbness, and sometimes complications in fingers and toes when exposed to cold or stress.

Chronic Arterial Insufficiency

A condition caused by the narrowing of arteries that leads to decreased blood flow to limbs, often resulting in pain and skin changes.

Deep-Vein Thrombosis

The formation of a blood clot within a deep vein, most commonly in the legs, which can lead to serious health complications.

Lymphadenopathy

The abnormal enlargement of lymph nodes, which can be a sign of infection, immune response, or malignant diseases.