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.

Question

Quizplus · Accepted Answer

The occurrence of national stop-smoking week during the experiment is considered an external event or factor that could influence the results of the experiment. This type of confounding is known as history. History refers to external events or factors that occur during the experiment and have an effect on the dependent variable.

John Conducted an Experiment to Test the Effectiveness of a Smoking