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What is not an appropriate method to handle heterogeneity in error variance?

Longitudinal studies examine changes that occur with age; what do cross-sectional studies examine?

Besides randomization, which of the following is a technique used to equalize initial group differences?

In an experiment an effect size is:

Susan has twelve subjects drop out of her study. Which threat to internal validity must she consider?

What is the proper order of the following designs if they are to be listed from the one with the least amount of control over variables to the most?

  Which design is represented below?  Group 1: Treatment – Post-Test   Group 2: No Treatment – Post – Test  

Internal External Validity

What is an example of a true experimental design?

Writing a Research Proposal