Validity
There are various types of validity.
Here are two types:
Internal validity
If there really does exist a relationship between two variables, your study is able to show this.
External validity
Your findings are able to be generalized beyond your study to other populations
Here are two types:
Internal validity
If there really does exist a relationship between two variables, your study is able to show this.
External validity
Your findings are able to be generalized beyond your study to other populations
There's various types of validity and the figure below illustrates this:
(Image source: http://blog.questionmark.com/understanding-assessment-validity-construct-validity)
To keep it simple for this course, you only need to keep in mind the following:
(Image source: http://www.wadsworth.com/psychology_d/special_features/ext/workshops/reliability3.html)