Author Question: While participating in a timed experiment, the participants in the experimental group had to leave ... (Read 33 times)

stock · **on:** Jun 20, 2018

While participating in a timed experiment, the participants in the experimental group had to leave the room because of a fire drill. Which potential threat to internal validity would this example illustrate according to Campbell and his colleagues?

a. maturation
b. selection
c. instrumentation
d. history

Question 2

A researcher notices that the participants assigned to the experimental group were less likely to attend the second session in his experiment than those in the control group.

The researcher is concerned that __________ might represent a potential threat to the internal validity of her study.
a. history
b. attrition
c. instrumentation
d. maturation