Exam 1 Flashcards
1
Q
Z score
A
(raw score - mean) / SD
2
Q
T score
A
Z (10) + 50
3
Q
Standard error of measurement
A
SDt *√ (1-rxx)
SDt = SD for sample or population
rxx = reliability coefficient
4
Q
Confidence Interval (CI)
A
Top: Observed score + (2)(SEM)
Bottom: Observed score - (2)(SEM)
(2) refers to SD, as we’re computing a 95% confidence interval
5
Q
Variance
A
Sum ( x1 - mean)^2 / n
6
Q
Standard Deviation
A
Square root of variance
7
Q
Mean
A
Average of all scores
Sum of scores / # of scores
8
Q
Median
A
Middle score, or average of two middle scores
9
Q
Mode
A
Most repeated score
10
Q
Range
A
highest score - lowest score
11
Q
Sensitivity
A
A / (A + C)
12
Q
Specificity
A
D / (D + B)
