1. For the study described in (3), list any possible sources of bias you can think of that might threaten the internal validity of the study and explain how the bias could affect the results of the...

1. For the study described in (3), list any possible sources of bias you can think of that might threaten the internal validity of the study and explain how the bias could affect the results of the study.

2. For the study described in (3), evaluate the external validity of the study. How could this study be redesigned as a field experiment?