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Index
 »Â
PSY200 Research Methods in Psychology
 »Â
Chapter 1
 »Â
Measurement and Validity
level: Measurement and Validity
Questions and Answers List
Chapter 3
level questions: Measurement and Validity
Question
Answer
In measurement, construct validity occurs when the measure being used accurately assesses some hypothetical construct; it also refers to whether the construct itself is valid. In research, construct validity refers to whether the operational definitions used for independent and dependent variables are valid.
construct validity
Occurs when a measure appears to be a reasonable or logical measure of a trait (e.g., as a measure of intelligence, problem solving has more content validity than hat size).
content validity
Occurs when scores on a test designed to measure some construct (e.g., self-esteem) are correlated with scores on other tests theoretically related to the construct.
convergent validity
Form of validity in which a psychological measure is able to predict some future behaviour or is meaningfully related to some other measure.
criterion validity
discriminant validity Occurs when scores on a test designed to measure some construct (e.g., self-esteem) are uncorrelated with scores on other tests theoretically unrelated to the construct.
discriminant validity
Occurs when a measure appears, to those taking a test, a reasonable measure of some trait; not considered by researchers to be an important indicator of validity.
face validity
interval scale Measurement scale in which numbers refer to quantities and intervals are assumed to be of equal size; a score of zero is just one of many points on the scale and does not denote the absence of the phenomenon being measured.
interval scale
Produced by a factor that introduces inaccuracies into the measurement of a variable.
measurement error
Ways of assigning numbers to events; see nominal, ordinal, interval and ratio scales.
measurement scales
Measurement scale in which the numbers have no quantitative value but rather identify categories into which events can be placed.
nominal scale
Measurement scale in which the numbers indicate rank order, but convey no information about the magnitude of a score or the size of the differences between the measured entities.
ordinal scale
Measurement scale in which numbers refer to quantities and intervals are assumed to be of equal size; a score of zero denotes the absence of the phenomenon being measured.
ratio scale
The extent to which measures of the same phenomenon are consistent and repeatable; measures high in reliability contain a minimum of measurement error.
reliable
In general, the extent to which a measure of X truly measures X and not Y (e.g., a valid measure of intelligence measures intelligence and not something else).
valid
