Part 2 of these notes will cover:
- Data types and data sources.
For the previous version of these notes that cover Data, Information and Knowledge please see: http://getrevising.co.uk/resources/data_information_knowledge_and_processing_1
Data can be grouped into 'Data Types'. There are five of these data types you will need to know:
The boolean data type allocates one of two values - true and false. These values can be used to represent anything with two states such as "Male/Female", "Yes/No" or "L6th/U6th".
This can hold data where the response can only be one of these two values and is usually phrased as a closed question such as:
"Are you Male?" or "Does the property have a garage?"
This data type contains numbers which will have decimal places. For example: "45.78", "123.405" and "12.00" It is used to hold numbers where precision is important such as:
- Measurements in a house or building (2.7m wide)
- Height of a person. (1.82m)
- Price of goods (£199.99)
The integer data type contains whole numbers with NO decimal places, for example: "45", "125" or "14945".
It is used where accuracy may not be relevant, of vital importance or the value is specifically a whole number. For example:
- Tv Channels
- Large amounts of money (House prices)
Currency may be a real or an integer. If it is a relatively small amount then it will be real (£16.99), however if the amount is large then it…