What are extraneous and confounding variables

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Reference no: EM131321191

1. Describe four types of invalidity that can be found in experimental research designs.

2. What are extraneous and confounding variables? Which type of variable is most dangerous to the statistical conclusion validity and the internal validity of experimental research, and why?

3. What is confounding, and how does confounding produce alternative explanations?

Reference no: EM131321191

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