How does a time series design with nonequivalent control group differ from a nonequivalent control group design? What threat to internal validity is controlled by adding a nonequivalent control group to a simple interrupted time series design?

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The Answer is The time series design with nonequivalent control group differs from a nonequivalent control group design because in the time series design there are multiple observations before and after the time the treatment is administered.Many potential threats to internal validity due to history are controlled by adding a nonequivalent control group to a simple interrupted time series design.

How Does a Time Series Design with Nonequivalent Control Group