The fact that young children's articulation problems often disappear by themselves over time indicates why researchers must use ____in order to have internal validity.
A) control groups
B) informed consent
C) objective measurement
D) pre- and postmeasures
E) statistical analysis

Question

Quizplus · Accepted Answer

Control groups are necessary in order to rule out the possibility that the children's articulation problems disappeared due to some external, uncontrolled factor rather than simply due to time passing. By comparing a group of children with articulation problems to a control group of children without articulation problems, researchers can be more confident that any changes in the articulation group are due to the intervention or natural processes of development, rather than some other confounding variable. Informed consent and objective measurement are important ethical considerations but do not directly address internal validity. Pre- and postmeasures and statistical analysis are important tools for measuring change over time, but they do not address the issue of external validity.

The Fact That Young Children's Articulation Problems Often Disappear by Themselves