Benjamin Franklin

In: English and Literature

Submitted By mbell
Words 577
Pages 3
Reliability and Validity

During this paper the different types of reliability and validity will be discussed. Reliability and validity will then be applied to the Human Services profession in showing how they apply to the Human Services field. There will be two methods of data collection presented as well as why they are important to this field.
Reliability is defined as: “the ability to be relied on or depended on, as for accuracy, honesty, or achievement” (Webster dictionary). The central method that reliability is measured is the test/retest theory. According to Carmine, “The more consistent the results given by repeated measurements, the higher the reliability of the measuring procedure; conversely the less consistent the results, the lower the reliability” (Carmine and Zeller pg 12). For example, a blood pressure machine can be used to test and re-test your blood pressure. When measuring one’s blood pressure repeatedly one will get similar results at that given time. Any measuring appliance is legitimate if it does what it is intended to do by giving consistent results on repeated measurements. Another common way in measuring reliability is by using Cronbach’s Alpha. According to Santos, “Cronbach's Alpha is a numerical coefficient of reliability. Computation of alpha is based on the reliability of a test relative to other tests with same number of items, and measuring the same construct of interest” (Santos, volume 32).

Validity is defined as: “the state or quality of being valid: to question the validity of the argument” (Webster Dictionary). Carmine states, “While the definition of validity seems simple and straight forward, there are several different types of validity that are relevant in the social sciences” (Carmine and Zeller pg 17). There are three different types of validity. The first one being Criterion-Related Validity.…...