A group of friends are discussing the relationship between internal and external validity.Who is right?

Frances: External validity and internal validty are not related at all. Internal validty is for experimental research, external validity is for correlational research.

Piper: If a study has high internal validity that doesn't necessarily mean external validity is high. Internal validity is concerned with whether the change in the dependent variable due to the independent variable. Sometimes a study with high internal validity does not have high external validity due to the controlling nature of an experiment.

Judy: If a study has high internal validity it will also have excellent external validity.Internal validity is concerned with is the change in your dependent variable due to your independent variable.If internal validty is high you can generalize this finding to many other situations or people.