The test of validity and reliability are extremely important in any research and they can be described as being pivotal in the field of psychological research. They should be assessed in a manner that is right to the scientific community and which follows the rights methods.
Forensic psychology can be described as the intersection that exist between psychology and the justice system. In many cases, it often involves the fundamental legal principles and in particular it deals with expert witness testimony.
Effect size can be described as the size, magnitude and size of an effect. The effect size can be calculated from any number of statistical outputs and consequently expressed as the strength or magnitude of the desired reported relationship