Explain how the presence of a control group accounts for threats to internal validity. Summarize the types of threats to internal validity that can be avoided by utilizing random assignment to control and experimental groups.

Explain how the presence of a control group accounts for threats to internal validity. Summarize the types of threats to internal validity that can be avoided by utilizing random assignment to control and experimental groups.

500+ words with 1 reference.

Salkind, N. J. (2012). Exploring Research. (5th ed.). Pearson Prentice Hall.

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