Measures of central tendency and dispersion Flashcards
1
Q
What are the measures of central tendency?
A
- mean = average
- median = middle
- mode = most frequent
2
Q
Describe the mean.
A
- average
- most sensitive as it includes all data in calculation
- more representative
- easily distorted by extremes
3
Q
Describe the median?
A
- extremes do not affect it
- easy to calculate
- less sensitive, less representative
4
Q
Describe the mode.
A
- easy to calculate
- crude measure, not representative
- useful for data in categories
5
Q
What are measures of dispersion
A
- range
-standard deviation
6
Q
What is range?
A
Highest - lowest
7
Q
What is SD?
A
-how far scores deviate from the mean
- larger the SD< larger the dispersion of data
- more precise and can be distorted by a single value
