A Researcher Is Evaluating the Changes in Performance That Occur

question 4

Multiple Choice

A researcher is evaluating the changes in performance that occur during a six-week training program. Participants are observed at the beginning and at the end of the program and the researcher rates each individual's level of performance. When the researcher's standards for rating performance change from the first observation to the last, then the internal validity of the study is threatened by ____.

• A) history
• B) instrumentation
• C) maturation
• D) statistical regression

---

Definitions:

Recessive Gene Pair

Two copies of a gene on a chromosome that must both be present for a recessive trait to be expressed.

Extra Chromosome

An abnormal condition where an individual has more than the usual number of chromosomes, leading to genetic disorders.

Mental Retardation

This term, now considered outdated and offensive, was formerly used to describe developmental delays in intellectual functioning and adaptive behavior. The more accepted term is "intellectual disability."

Motor Retardation

A delay or slowness in the development or use of the motor skills that significantly interferes with daily living.