Lecture 3 Flashcards
1
Q
Measures of location
A
center of the dataset/distribution
2
Q
measures of variation
A
define variation around centre
3
Q
location
A
typical or central value that best describes the data
4
Q
mode
A
number repeated most often
- may not exist
- not affected by outliers
5
Q
median
A
middle value
- always exist
- not affected by outliers
6
Q
weighted mean
A
data points don’t all contribute the same amount
7
Q
calculating median
A
to find position:
(n+1)/2 if odd
n/2 if even
8
Q
nominal variable
A
data cannot be ordered (qualitative)
9
Q
ordinal variable
A
data can be ordered (qualitative)
10
Q
quantitative variables
A
data are ordinary real numbers
11
Q
median divides
A
into 2
12
Q
quartiles
A
divides into 4 parts
13
Q
deciles
A
divides into 10 parts
14
Q
percentiles
A
divides into 100 parts
