Measures of central tendency and dispersion Flashcards
1
Q
What are measures of central tendency?
A
Descriptive statistics that tell us about the ‘typical value’ of a data set.
2
Q
What are the 2 measures of dispersion?
A
Range and standard deviation.
3
Q
What is nominal data?
A
Data in separate categories.
4
Q
What is ordinal data?
A
Data is ordered in some way (e.g. ranked). The difference between each item is not (necessarily) the same.
5
Q
What is interval data?
A
Data is measured using units of equal interval.
6
Q
What is ratio data?
A
There is a true zero point as in most measures of physical quantities.
7
Q
Give examples of interval and ratio data.
A
Interval - temperature, year
Ratio - distance, area
8
Q
Define standard deviation.
A
Shows the amount of variation in a data set by expressing the spread of data around the mean.
