Understanding numerical and statistical skills - processing data
The accurate use of dataValues, typically letters or numbers. is important as it allows for sensible conclusions to be reached.
How do I process data?
Processing data is manipulating it to make it more useful. There are many ways to process data, using:
- simple ratioThe relative sizes of two or more numbers, shown as whole numbers. For example, 1:2 or 3:2. to show a relationship between two sets of data, and are shown as two numbers with a colon symbol in-between. Ratios would work well to illustrate, eg number of people per doctor.
- proportionA part, share, or number considered in comparison to the whole. which similar to ratio, but are written slightly differently, eg 1 in 10. Proportions would be useful to illustrate, eg the number of tourists within an area.
- averageA value to best represent a set of data. There are three type of average - the mean, the median and the mode., or measures of central tendency, are commonly taken in three different ways:
- Mean - add the total of all values that have been collected and then divide by the number of values.
- Median - write out all of the numbers that have been collected in numerical order and find the middle number.
- Mode - the most commonly appearing value within the data.
- percentageA proportion representing parts per hundred, for example 9% is 9 out of 100, or 9/100. which can either show proportions or change over time. Percentages would be useful to illustrate, eg land use within an area.
It is important to think about how to justify why the data has been processed in a particular way.