For a specific threat to internal validity or source of bias ... and their impact on findings discussed a Introduction and conclusion sections are not included, since they do not provide direct ...

Internal validity has been found to be only a part of external validity and is not a guarantee that the conclusion will hold in the world (Parasuraman, Grewal, Krishnan, 2004). If you can control ...

The final threat to internal validity is an interaction of the selection ... their impact on findings discussed a Introduction and conclusion sections are not included, since they do not provide ...