Quantitative Data Analysis
- Created by: lucyholly16
- Created on: 30-01-15 19:34
View mindmap
- Quantitative Data Analysis
- Measures of Central Tendency
- Mean
- Advantage
- It makes us of the values of all the data
- Calculated by adding all the numbers and dividing by the number of numbers
- Disadvantage
- It can be misrepresentative of the data as a whole if there are extreme values
- It cannot be used with nominal data
- Advantage
- Median
- Advantage
- Not affected by extreme scores
- Disadvantage
- Not as 'sensitive' as the mean because not all values are reflected in the median
- The middle value in an ordered list
- Advantage
- Mode
- Advantage
- Useful when the data are in categories i.e. nominal data
- Disadvantage
- Not useful way of describing data when there are several modes
- The value that is most common
- Advantage
- Mean
- Measures of Dispersion
- Range
- Advantage
- Provides you with direct information
- Easy to calculate
- Take the smallest number away from the largest number
- Disadvantage
- Affected by extreme values
- Doesn't take into account the number of observations in the data set
- Advantage
- Standard Deviation
- This is a measure of the spread of the data around the mean
- Advantage
- More precise measure of dispersion because all values taken into account
- Disadvantage
- May hide some of the characteristics of the data set (e.g. extreme values)
- Range
- Visual Data
- Scatter
- A kind of graph used when doing correlational analysis
- Bar
- The height of the bar represents frequency. Shows data in categories but also suitable for numbers.
- Line
- As with a bar chart , the y axis represents frequency but, in this case, the values along the x axis must be continuous i.e. data that have some implicit order such as numerical data but not categories of things such as favourite football teams
- Tables
- The numbers you collect are referred to as 'raw data' - numbers that haven't been treated in any way. These data can be set out in a table or summarised using measures of central tendency and range
- Scatter
- Measures of Central Tendency
Comments
No comments have yet been made