Ch 2 Flashcards
1
Q
Standard Deviation
A
average amount by which scores vary from the mean
The most important measure of variability
2
Q
Standard Score
A
Distance an individual’s raw score is above or below the mean of a reference group
3
Q
Percentages of data relative to the mean on the normal curve
A
1 SD = 68 %
2 SD = 95 %
3 SD = 99%
4
Q
z scores
A
Most common standard score
Mean is always 0
5
Q
t-scores
A
mean = 50 SD = 10
T scores cannot be negative
6
Q
Stanine
A
Converts raw scores into one of nine possible scores (slices normal curve into nine parts)
Do not need to cnvert score to get stanine
Mean = 5
Sd = 1/2 deviation wide
