Explain how classical experiments guard against the threats of invalidity.

Discussion Questions:
Discussion Board Question #1 Classical Experiment:
What is a classical experiment? Explain how classical experiments guard against the threats of invalidity.

Recognize that experiments are well suited for the controlled testing of causal processes and for some evaluation studies.
Describe how the classical experiment tests the effect of an experimental stimulus on some dependent variable through the pretesting and posttesting of experimental and control groups

Discussion Board Question #2 Sampling:
Define and explain in detail probability and nonprobability sampling. What are the purposes of each type of sampling?

Tips for staying on topic:
Discussion #1 assigment will allow you to recognize that experiments are well suited for the controlled testing of causal processes and for some evaluation studies.
Discussion #2 will allow you to understand how the logic of probability sampling makes it possible to represent large populations with small subsets of those populations.

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