John Conducted an Experiment to Test the Effectiveness of a Smoking

question 13

Multiple Choice

John conducted an experiment to test the effectiveness of a smoking cessation program.The experiment took place over a one-month time period.Participants in the control group and the experimental group (those who participated in the smoking cessation program) recorded the number of cigarettes that they smoked each day.John was unaware that "national stop-smoking week" also happened to take place during the one-month time period of his experiment.John's experiment is now confounded by

• A)maturation.
• B)history.
• C)regression to the mean.
• D)mortality.

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Definitions:

Sternocleidomastoid

A muscle in the side of the neck that helps rotate the head and flex the neck.

Serous Membranes

Thin membranes that cover the walls and organs in the thoracic and abdominal cavities, producing serous fluid to lubricate and reduce friction between organs.

Mucous Membranes

Tissue linings that secrete mucus, serving as a protective barrier in various organs and cavities within the body.

Synovial Membranes

Membranes lining the joint cavities, producing synovial fluid to lubricate and nourish the joints.