EXAM STUDY GUIDE
1. Scales of Measurement
a. Nominal, ordinal, interval, ratio. When used? Know examples for each.
2. Describing the population’s scores:
a. Central tendency
i. Mean, median, mode. Why they are not sufficient?
b. Variability
i. SD, variance
c. Normal distribution
i. Percentiles, SDs, % within +/- 1 SD, +/- 2SD, etc.
d. Positively and negatively skewed. What do they mean?
3. Percentile rank & Standard Scores
a. Z-scores
b. T-scores
c. Stens, stanines
d. IQ
4. Interpretation
a. Norm referenced, criterion referenced. Defined.
5. Reliability
a. Defined & why important?
b. How is it related to measurement error?
c. Reliability coefficient. How is it reported?
d. Types of reliability
i. Stability over time
1. Test-retest
2. Alternate forms
ii. Internal consistency/stability
1. Split half
2. KR20, KR21
3. Cronbach’s Alpha
iii. What size coefficient is acceptable?
e. SEM
i. Defined, calculated, and interpreted.
ii. Confidence Interval (CI). How to calculate CI and use CI to report score?
1. Scales of Measurement
a. Nominal, ordinal, interval, ratio. When used? Know examples for each.
2. Describing the population’s scores:
a. Central tendency
i. Mean, median, mode. Why they are not sufficient?
b. Variability
i. SD, variance
c. Normal distribution
i. Percentiles, SDs, % within +/- 1 SD, +/- 2SD, etc.
d. Positively and negatively skewed. What do they mean?
3. Percentile rank & Standard Scores
a. Z-scores
b. T-scores
c. Stens, stanines
d. IQ
4. Interpretation
a. Norm referenced, criterion referenced. Defined.
5. Reliability
a. Defined & why important?
b. How is it related to measurement error?
c. Reliability coefficient. How is it reported?
d. Types of reliability
i. Stability over time
1. Test-retest
2. Alternate forms
ii. Internal consistency/stability
1. Split half
2. KR20, KR21
3. Cronbach’s Alpha
iii. What size coefficient is acceptable?
e. SEM
i. Defined, calculated, and interpreted.
ii. Confidence Interval (CI). How to calculate CI and use CI to report score?
