Statistics- Measures of Location Flashcards
1
Q
Mean
A
Σ all values / Number of values
2
Q
Mean from grouped frequency table
A
Σ fx / Σ x
3
Q
Mean advantages
A
Uses all the data
Can be calculated exactly
4
Q
Mean disadvantages
A
Affected by extreme values
Can’t be found graphically
Can give impossible figures for discreet data (ie 2.34 children)
5
Q
Median
A
(n+1)/ 2
6
Q
Median for grouped data
A
Use a cumulative frequency graph
7
Q
Median advantages
A
Not influenced by extreme values Unaffected by irregular class widths
8
Q
Median disadvantages
A
Can only be estimated for grouped data
Doesn’t always represent the data
9
Q
Mode
A
Most frequent values
10
Q
Mode advantages
A
Unaffected by extreme value
Can be used for non-numerical data
11
Q
Mode disadvantages
A
Can be more than one
May not accurately represent the data
