Number Types

Cardinal Numbers

Also known as Primary Numbers and Cardinals.
These are whole numbers (not fractions or decimals)
These numbers are for counting.
They are a general term used to describe how many of something there is.

1	one
2	two
3	three
4	four
5	five
6	six
7	seven
8	eight
9	nine
10	ten
11	eleven
12	twelve
13	thirteen
14	fourteen
15	fifteen
16	sixteen
17	seventeen
18	eighteen
19	nineteen
20	twenty

Ordinal Numbers

These numbers are for ordering.
They indicate the position of something.
They are used to describe the position of something in a list.

1st	first
2nd	second
3rd	third
4th	fourth
5th	fifth
6th	sixth
7th	seventh
8th	eighth
9th	ninth
10th	tenth
11th	eleventh
12th	twelfth
13th	thirteenth
14th	fourteenth
15th	fifteenth
16th	sixteenth
17th	seventeenth
18th	eighteenth
19th	nineteenth
20th	twentieth

Prime Numbers

A prime number is a whole number greater than 1 that can only be divided evenly by 1 and itself.
If a number is not prime, then it is a Composite Number
A composite has more than 2 factors.

Nominal Numbers

These are numbers that are used to refer to objects or categories.
They have a one to one relationship with something
For example bus numbers, bank sort-code, bank account number.

Summary Statistics

When you have a collection of numbers how can you describe what type of numbers you have ?
Is there a way of describing this data in a concise and accurate way?
The answer is yes, we can use Summary Statistics
Exactly which type of summary statistics we use will depend on the type of data that we are trying to describe.

Types of Summary Statistics

When our data is related to a single Quantity there are two main types of summary statistics
1) Measures of Location (Link - distributions/central-tendency) - what is the size of the numbers
2) Measures of Spread (or dispersion) (Link - distributions/dispersion) - how much do the numbers vary
Data that is concerned with a single Quantity is called "univariate data"