Control Group in Pretest-Posttest Designs

Strengths of Switching Replication

Which of the following best describes maturation as a threat to internal validity?

If an observed difference in a study's dependent variable is actually due to participants naturally growing older, learning, or becoming fatigued between measurements, this represents a maturation threat.

A researcher is concerned that maturation is threatening the internal validity of their study. Match each research scenario with the specific type of natural, internal change that is likely influencing the results.

A researcher evaluates a year-long logic intervention for children and finds that their reasoning scores improved significantly. Arrange the steps the researcher should follow to analyze whether this finding is actually due to the intervention or represents a maturation threat.

You are designing a research project to evaluate whether a new 12-month 'Early Literacy' program increases the reading readiness of toddlers. Given that toddlers' reading readiness naturally improves as they mature cognitively over a year, which of the following research plans should you construct to ensure that any observed improvement is due to the program rather than natural maturation?

A researcher concludes that a full-day intensive workshop decreased participants' focus because their test scores were lower at 5:00 PM than they were at 9:00 AM. A colleague argues that participants likely just became naturally tired over the course of the day—not because of the workshop. This alternative explanation is an example of the internal validity threat known as _____.

In psychological research, the threat to internal validity that occurs when participants undergo natural developmental or physiological changes—such as growing older, learning, or becoming fatigued—between pretest and posttest measurements is known as _____.

A researcher evaluates a 10-hour intensive study session by testing students' focus at 9:00 AM (pretest) and again at 7:00 PM (posttest). If the researcher concludes that the study session itself caused a decrease in focus, but the decline was actually due to the students naturally becoming tired, the internal validity of the study is threatened by maturation.

A researcher is analyzing different potential explanations for changes observed between pretest and posttest in a study. Match each description of a participant's change with the specific maturation-related threat it represents.

Arrange the steps a researcher should take to evaluate and control for a potential maturation threat in a pretest-posttest design.

Define maturation as a threat to internal validity and provide at least three examples of natural changes that can occur between pretest and posttest measurements in a study.

Based on the concept of maturation as a threat to internal validity, diagnose why the researcher's conclusion might be flawed and explain what alternative factor could account for the observed differences.

A psychologist is measuring the effect of a relaxing scent on cognitive performance by having participants take a complex, two-hour pretest in a normal room, followed immediately by a two-hour posttest in a scented room. Identify the specific type of maturation threat that is most likely to affect this study and explain how it would influence the posttest scores.