Which of the Following Situations Represents a Threat to Internal

question 3

Multiple Choice

Which of the following situations represents a threat to internal validity in an experimental study measuring the effect of audio-taped instructions to patients being discharged home after coronary artery bypass graft surgery?

• A) Both men and women were included as subjects in the study.
• B) Two new surgeons recently began performing the coronary artery bypass graft surgeries.
• C) Patients in the experimental group passed their tapes on to those in the control group receiving usual care.
• D) Data collection took 1 year.

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Definitions:

Measure Retention

The process of evaluating the extent to which information or skills have been maintained or remembered over a period of time.

Recognition

Recognition is the cognitive process of identifying previously encountered events, objects, or people, demonstrating the ability to recall their features.

Retention Assessment

The evaluation of the extent to which information or skills have been remembered or retained over a period.

Canadian Charter

Also known as the Canadian Charter of Rights and Freedoms, it is part of Canada's Constitution that protects various individual rights and liberties.