Processing and Representing Data 2 Flashcards
Database
A database is a collection of information
Two way tables
Shows information in two catagories
Bivariate data
Data that has two variables
Pictogram
Uses symbols or pictures to represent a number of items
What must be common on a bar chart?
- Bars are equal width, with equal spaces
- The height (or length) of the bar represents the frequency
Vertical line graph
Is similar to a bar chart, but with lines instead of bars
Multiple bar charts
Have more than one bar for each class. A key shows what each bar represents. It’s easy to compare the frequencies of each chart.
Composite bar chart
compares data for each category in a single bar, divided into components that show frequency for each part. A key identifies each component.
Stem and Leaf Diagram
shows numerical data split into a ‘stem’ and ‘leaves’. The numbers written in order.
Back-to-Back stem and leaf diagrams
Shows two sets of data with the same stem, the smallest values on each row are nearest the stem.
Pie Chart
A form of displaying data in a circle with the proportions of shared data in proportion
The angles of a pie chart add up to ???
360
Comparative pie charts
Used to compare two sets of data
Population Pyramids
Show the age groups in a population, usually divided by gender
Chloropleth map
Used to classify regions of a geographical area
Histogram
Similar to a bar chart but represents continuous data, there are no gaps as data is continual
Frequency polygon
A histogram with joint mid-points
Cumulative frequency
Running total of frequencies
Cumulative frequency step polygon
Used for discrete data to plot cumulative frequency’s against the upper classes
Cumulative frequency diagrams
Can be used to estimate or predict other values
