Psychometrics
What is the mean?
The average score
The middle score
The most frequently occurring score
What is the mode?
The average score
The middle score
The most frequently occurring score
What is the median?
The average score
The middle score
The most frequently occurring score
Is this graph unimodal or bimodal?
Unimodal
Bimodal
Is this graph unimodal or bimodal?
Unimodal
Bimodal
Describe this curve
Positively skewed
Symmetrical
Negatively skewed
Describe this curve
Positively skewed
Symmetrical
Negatively skewed
Classical Test Theory (hint: X = observed score; T = true score; E = error)
X = T - E
X = T + E
T = X + E
T = X - E
Reliability is...
Consistency and precision of test results
How often a test can be taken
Meaningfulness or appropriateness of result interpretations
Probability that a person can lie or falsify results
Validity is...
Consistency and precision of test results
How often a test can be taken
Meaningfulness or appropriateness of result interpretations
Probability that a person can lie or falsify results
Types of validity (choose multiple)
Predictive validity
Convergent validity
Test-retest validity
Divergent validity
Interrater validity
Types of reliability (choose multiple)
Predictive reliability
Internal consistency
Test-retest reliability
Alternate form reliability
Interrater reliability
Convergent reliability
What does variance measure?
The accuracy of what a test measures
The amount of spread in a set of scores
The average range of scores
What does "regression to the mean" mean?
A person will score closer to the mean or average score the next time they take the test
The further from the mean, the less frequent a score is
When there are outliers, the curve will skew either positively or negatively
The closer to the mean, the more likely the score will be replicated
Z-score equivalent for 50th percentile
50
100
1
0
T score equivalent for standard score of 100
50
100
1
0
Percentile equivalent for standard score of 100
50
100
1
0
What percentage of the population is within 1SD from the mean?
60%
68%
95%
99.7%
How many standard deviations from the mean encompasses 95% of the population?
1SD
1.5SD
2SD
3SD
What does a positive correlation indicate?
As one variable increases, the other variable decreases
The relationship between two variables is strong
As one variable increases, the other variable increases
The relationship between two variables is weak
What does a negative correlation indicate?
As one variable increases, the other variable increases
The relationship between two variables is weak
As one variable increases, the other variable decreases
The relationship between two variables is strong
In a nominal scale, data can be...
Categorized
Categorized and ranked
Categorized, ranked, and are evenly spaced
Categorized, ranked, are evenly spaced, and has a natural zero
In a ordinal scale, data can be...
Categorized
Categorized and ranked
Categorized, ranked, and are evenly spaced
Categorized, ranked, are evenly spaced, and has a natural zero
In a interval scale, data can be...
Categorized
Categorized and ranked
Categorized, ranked, and are evenly spaced
Categorized, ranked, are evenly spaced, and has a natural zero
In a ratio scale, data can be...
Categorized
Categorized and ranked
Categorized, ranked, and are evenly spaced
Categorized, ranked, are evenly spaced, and has a natural zero
Are percentiles good for comparing scores?
Yes, because they are easily understood by parents
Yes, because they are used in all test interpretations
No, because they do not accurately estimate score differences
No, because they are often confused with percentages
What are the best scores to use to make comparisons?
Raw scores
Standardized scores
Percentiles
True scores
Can you measure someone's true score?
Yes, the true score is the raw score + the error
Yes, the true score is the same as the raw score
No, the true score does not include any error
No, the true score does not exist
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