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1. Standardized Testing (1) EDU 330: Educational Psychology
Daniel Moos
4. Statistics and standard scores (2)
Standard Deviation (SD):
Statistical measure of spread of scores
If data points are close to mean, then SD 0
If many data points are not close to mean, then SD >
5. Statistics and standard scores (3)
Standard Deviation (SD): Translating into percentile ranks
Example: Mean of scores is 80 and standard deviation of 6
6. Statistics and standard scores (4) Evaluating standardized tests through descriptive statistics, continued
Standard Error of Measurement
Due to measurement error, scores represent an approximation of students true score
Example:
Tonka obtains a score of 80 on a standardized test.
Standard error of measurement is 6
The range of Dans true score would be 74 to 86.
7. Statistics and standard scores (5) Raw Scores:
What do they really mean?
Percentiles:
? percentages
Rankings are not equal (e.g., raw score of 58 = 90th percentile, raw score of 56 = 80th, 54 = 60th, 53 = 50th)
Stanines:
Range: 1 to 9
Stanine 5 = center of distribution
Each Stanine above/below is +/- 0.5 SD
Example: Stanine 7 = +1 SD; Stanine 3 = -1 SD; Stanine 8 = __SD
Grade equivalents:
Compares scores with particular age group (1st digit = grade,
2nd digit = month)
Example: Grade equivalent for total reading of 8.4 means __ ?
9. Suggestions for preparing your students for taking standardized tests(1)
10. Suggestions for preparing your students for taking standardized tests(2)
11. Standardized Testing &Technology