Psychometrics Flashcards
(26 cards)
Reliability is the…
a. overall consistency of a measure.
b. determined when the measure is well-founded and corresponds accurately to the real
world.
c. the degree to which evidence and theory support the interpretations of test scores
d. whether a test appears to measure a certain criterion
A. Overall consistency of a measure
Face Validity is the…
a. overall consistency of a measure.
b. determined when the measure is well-founded and corresponds accurately to the real
world.
c. the degree to which evidence and theory support the interpretations of test scores
d. whether a test appears to measure a certain criterion
D. Whether a test appears to measure a certain criterion
A ‘z score’ is used to…
a. calculate the distance to the planet Zenon.
b. measure a score’s relationship to the mean in a group of scores.
c. describe IQ scores
d. used to tell individuals how far their score is from the mean
B. Measure a score’s relationship to the mean in a group of scores.
A ‘T score” is used to…
a. make tea
b. measure a score’s relationship to the mean in a group of scores.
c. describe IQ scores
d. used to tell individuals how far their score is from the mean
D. Used to tell individuals how far their score is from the mean
How do you compute the standard deviation?
Square root of the variance
What are the four types of data?
- Nominal
- Ordinal
- Interval
- Ratio
Describe nominal data.
Data that is organized by categories (e.g. make of car, gender, etc).
Describe ordinal data.
Data is ranked in order (e.g. birth order, rank in class)
Describe interval data.
data that is meaningful difference between values. There is no 0-point value. (e.g. likert type scale, temperature).
Describe ratio data.
has all the properties of an interval variable, and also has a clear definition of 0.0. When the variable equals 0.0, there is none of that variable. Variables like height, weight, enzyme activity are ratio variables.
What is reliability?
overall consistency of a measure. Produces similar results under consistent conditions
What are the three forms of reliability?
- Test-Retest
- Internal consistency
- Alternate Form
Describe internal consistency.
Internal consistency looks for reliability within subscales and subtests. It looks for consistent patterns from item to item. There are two types of internal consistency:
- Split-Half
- Coefficient Alpha
What is validity?
The extent to which a test measures what it claims to measure.
What is content validity?
The degree to which an item captures the construct being measured.
What is Criterion-Related validity?
the extent to which a measure is related to an outcome; how does a test perform in relation to some standard
What is construct validity?
measures how well a test conforms to a theoretical notion in psychology.
What are the three main types of validity?
- Content Validity
- Criterion-Related Validity
- Construct Validity
Describe and define the difference between convergent validity and discriminant validity.
Convergent validity is when the measure correlates highly to other measures that claim to study the same constructs. Discriminant validity is when the measure does not correlate to measures it should be different from.
Describe the Standard Error of Difference.
Statistic used to identify if the difference between 2 obtained scores is significant
Describe the Standard Error of Estimate.
Statistic used when trying to predict what score a person will obtain on a test, depends on the criterion variable.
What is a Type 1 Error?
It is a false positive. The error of rejecting the null hypothesis when it is actually true
What is a Type II Error?
It is a false negative. The error of not rejecting the null hypothesis when the alternative hypothesis is true.
What is the equation for a Z score?
(obtained score - mean)/standard deviation
