Compare and contrast internal and external validity Describe

Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern. Describe and give examples of research questions in which internal validity is a primary concern.

Solution

Internal validity examnes whether the observed effect on a dependent variable is actually caused by the independent variables.It is impossible to draw conclusion without studying or performing internal validity.Control of extraneous variables is a must for inference.

External validity it refers to generalization of the results.for any experiment it is desired to have an experiement valid both internally and externally.

For example

Effectiveness of sales training. If the sales person are aware of the measuring of effectiveness then the sales person behaves differently.