GCSE Statistics

What is raw data

What is raw data

Unprocessed data that has Just been collected. Needs to be ordered, grouped , rounded, cleaned

what is Qualitative data

Non-numerical, descriptive data such as eye/hair colour or gender. It is usually more difficult to analyse.

what is Quantitative data

Numerical data that Can be measured with numbers. Easier to analyse than quantitative data. Example, height, weights, marks in an exam etc.

what is Discrete data

it Only takes particular values such as shoe size or number of people., It can be grouped into classes (0-11, 11-15), using smaller intervals when data is close together

what is continuous data

data that Can take any value e.g. height, weight., grouped using inequalities

what is categorical data

data that can be sorted into non-overlapping categories such as gender. Used for qualitative data as its easily processed.

what is ordinal data

quantitative data that can be given an order or ranked on a scale , e.g. marks in an exam.

what is bivariate data

Involves measuring 2 variables. Can be qualitative or quantitative, grouped or ungrouped. used with scatter diagrams where the two axes represent the two different variables.

what is multivariate data

dade that is made up of more than 2 variables, e.g=comparing height, weight, age together

what is grouping data

It uses table to spot patterns to see how it is distributed

Pros of continuous and discrete data

Makes data easy to read+ understand, easy to spot pattern and compare data

Cons of continuous and discrete data

Loses accuracy ass exact value is unknown, Calculations made is an estimate(e.g=mean)

what is primary data

Data you have collected, or collected on ur behalf

what is secondary data

data that has already been collected

Pros of primary data

accurate, collection method known

cons of primary data

time consuming, expensive

pros of secondary data

cheap, easy, quick, data from some organisations can be reliable

cons of secondary data

method of collection unknown, data can be out of date, can contain mistakes, may be from unreliable sources