Mrs Holmes (validity) Flashcards
What is validity?
The extent to which a study sets out to measure what it sets out to measure.
What are the two types of validity?
Internal validity and external validity.
Explain internal validity?
Refers tot he extent to which we can be sure that the findings of a study are due to the mechanisms suggested.
What can internal validity be affected by?
unwanted confounding variables, demand characteristics, experimenter effects.
Explain demand characteristics?
Participants pick up as to work out the hypothesis so they behave according to what they think is expected of them.
Explain experimenter effects?
Anything about the inspector that changes the participants behaviour.
What is an example of experimenter effects?
Nodding at the correct answers.
Explain external validity?
How much the findings can be generalized to situations beyond those in which the study was carried out.
What are the two types of external validity?
Population valdity, Ecological validity.
What is populaiton validity?
Extend to which findings can be generalised to other groups of people.
What is ecological value?
Extent to which research findings can be generalised to real ife situations. (how realistic is it)
What are some ways in which you can asses validity?
Face validity, Concurrent validity, Predictive validity.
Explain face validity?
Weakest form of requires making a common sense judgement about wheather or not a test seems to be valid.
Explain concurrent validity is done?
Obtains 2 scores at the same time, one using procedure of unknown validity and one using a methos validity has already been established if tesets show similar findings it would mean new method is valid.
Explain how predictive validity is done?
Similar to cuncurrent except two sets of data are obtained at different times.
