An explanation of internal and external variable-related validity factors

Write a 1,050- to 1,400-word paper describing the types and functions of research designs. Address each of the following in your paper:

An explanation of internal and external variable-related validity factors
The strengths and limitations of experimental research designs
A summary of two contemporary examples of experimental research conducted within the criminal justice field within the past 10 years

Format your paper consistent with APA guidelines.