Presenting Data

Presenting Data

1. Cumulative Frequency

   • add up the Frequency
   • Should make a 'S' curve
   • work out:
     • UQ
     • LQ
     • Medium
     • Interquartile range
   • Pecentages

2. Tree Diagrams

   • shows probability
     • work out the probablity
   • Replaced and non- replaced
     • non: minus total
     • Replaced: same pecentage
   • shows the trial and outcome
     • of 2 or more events
   • usually done in fractions
   • can be to prove an equation

3. Histograms

   • AREA OF THE BAR
     • Frequency
   • y axis is the Frequency density
   • x axis/y axis

4. Box Plots

   • median
   • UQ and LQ
   • IQR
     • middle 50%
   • links to Cumulative frequency
     • data off the graph
     • median, IQR
   • compare box plots
     • compare times
     • speed
     • looking at:
       • IQR
       • median
       • LQ and UQ

5. Scatter Graps

   • corrilaton
   • line of best fit

6. Frequency Polygons

   • Join the points
   • Not from the axis
   • like a line graph

7. Pie Graphs

   • Out of 360 degrees
     • y/total x 360
     • pecentages
   • shows data simply

8. Bar and line graphs

   • Discrete data
   • simplest of graphs
   • line: join the points
   • bar: every width must be the same
     • hight is frequency