Describe and differentiate between internal and external threats to validity in an experimental design. Recommend at least one action that you or any researcher can take in response to both internal and external validity threats.
What will be an ideal response?
Student responses will vary based depending on which threat they choose. Internal validity threats are procedures, treatments, instrumentation, and experiences of the participants that threaten the researcher’s ability to draw accurate inferences about the population. External validity threats are those involving inaccurate inferences that researchers make from the sample to the population and other settings. Threats to internal validity include history, maturation, regression to the mean, selection, mortality, diffusion of treatment, and instrumentation. One action that I can take in response to internal threats is to use the same instrument for the pretest and posttest. Threats to external validity include interaction of selection and treatment, interaction of setting and treatment, and interaction of history and treatment. One action that I can take in response to external threats is to conduct additional experiments in a new setting to determine if the same results occur.
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Research lacking some type of treatment can also be described as:
A) non-interventional B) quasi-experimental C) true experimental D) emergent experimental
When examining a published journal article, what characteristic suggests that it is a quantitative study?
a. The problem is a current issue b. The report is written in user-friendly terms c. The researchers do not refer to themselves d. The authors had firsthand experiences with the topic
. Explain how program evaluation is different from research.
What will be an ideal response?
What is a t-score?
What will be an ideal response?