Variability Flashcards
1
Q
Three things that variability tells us
A
- how much difference to expect from score to score
- how well the mean represents the score on the whole
- how well an individual score would represent the whole
2
Q
The two measures of variability
A
- range
- standard deviation
3
Q
Range
A
-difference b/n the highest and lowest value in your data set
4
Q
Standard Deviation
A
- the standard amount scores deviate from the mean
- the standard deviation is preferable over range to measure variability b/c it takes all scores into account, not just the two most extreme values
5
Q
When to use Mean as central tendency:
A
- use for interval, or ratio scale data
- not valid for nominal or ordinal scale data
6
Q
When to use The Mean as central tendency:
A
- used for ordinal, interval or ratio data
- not valid for nominal data
7
Q
When to use Mode as central tendency:
A
-used for all scales
8
Q
Variability
A
-refers to the degree to which scores in a distribution are spread out or clustered together
