The nurse is conducting a study on heart clients who are actively involved in exercise programs following a heart attack. The nurse should consider which as a threat to internal validity?
A) Some subjects run faster on the treadmill when a researcher walks through the room.
B) Including an exciting new cross-fit training program as one of the exercise options that can accommodate a few of the study subjects
C) Your fervent belief from personal experience that intense cardiovascular exercise can speed recovery and prevent further heart attacks
D) Using a variety of stationary bicycles for stress testing
Ans: D
Feedback:
A threat to internal validity is instrumentation, which refers to changes in the measurement instrument used in the study and which results in inconsistent data collection. Threats to external validity include reactivity, novelty, and experimenter/participant effect.
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