Lecture 3.1 Flashcards
1
Q
two types of norm score
A
- relative, e.g. grades
- absolute, on a continuum
2
Q
mean disadvantage
A
- sensitive to extremes
3
Q
advantage median
A
- when data is skewed
4
Q
ceiling effect
A
- too easy items
5
Q
P1
A
- only 1% score worse
6
Q
P100
A
- higher score than everyone else
7
Q
P50
A
- the median
8
Q
quartiles
A
- P25, P50, P57, P100
9
Q
P2
A
- minus 2 SD
10
Q
P16
A
- minus 1 SD
11
Q
P84
A
- plus 1 SD
12
Q
P98
A
- plus 2 SD
13
Q
limitations of percentiles
A
- cannot calcultate mean
- less difference between P50 and P60 than between P95 and P99
14
Q
z scores
A
- mean = 0
- SD = 1
15
Q
advantages t score
A
- no negative scores
- no decimated scores
