Asked by Patrick Barber on Jun 16, 2024
Verified
Contrast the concepts of reliability and validity. How is each important for psychological assessment?
Reliability
The extent to which an instrument, tool, or process is consistently accurate and dependable when measuring what it is intended to measure.
Validity
The extent to which a test, measurement, or research accurately represents what it is intended to measure.
Psychological Assessment
Psychological Assessment is the process of using a combination of techniques to help arrive at some hypotheses about a person and their behavior, personality, and capabilities.
- Comprehend the principles of reliability and validity within the context of psychological evaluation.
Verified Answer
JL
Jasmine LoganJun 22, 2024
Final Answer :
A. Reliability is consistency of measurement.
1. Reliability can refer to test-retest or interrater reliability.
2. Reliability is typically expressed as a correlation coefficient, and this correlation expresses the degree of relationship between the two variables (first administration of a test versus second administration; Rater 1 versus Rater 2).
3. High reliability coefficients indicate consistent measurement, but low reliability coefficients are difficult to interpret.
B. Validity is accuracy of measurement.
1. Accuracy of measurement is judged against some independent criterion.
2. Validity may also be expressed as a correlation, reflecting the degree of relationship between the test score and the criterion.
C. Both reliability and validity are necessary for good measurement.
1. A measurement cannot be valid without being reliable, but a measurement can be reliable and still lack validity.
2. These coefficients are important in deciding about the acceptability of scores on psychological tests, and higher reliability and validity scores indicate better tests.
1. Reliability can refer to test-retest or interrater reliability.
2. Reliability is typically expressed as a correlation coefficient, and this correlation expresses the degree of relationship between the two variables (first administration of a test versus second administration; Rater 1 versus Rater 2).
3. High reliability coefficients indicate consistent measurement, but low reliability coefficients are difficult to interpret.
B. Validity is accuracy of measurement.
1. Accuracy of measurement is judged against some independent criterion.
2. Validity may also be expressed as a correlation, reflecting the degree of relationship between the test score and the criterion.
C. Both reliability and validity are necessary for good measurement.
1. A measurement cannot be valid without being reliable, but a measurement can be reliable and still lack validity.
2. These coefficients are important in deciding about the acceptability of scores on psychological tests, and higher reliability and validity scores indicate better tests.
Learning Objectives
- Comprehend the principles of reliability and validity within the context of psychological evaluation.