August 26, 2021
Sampling and More Complex diagrams
- Frequency Density = Frequency ÷ Class Width
- Frequency = Frequency Density x Class width
Histograms
- There is continuous data (no gaps between classes).
- When each class width/interval is not equal.
- The area (l x b) represents the frequency, not height.
When it comes to IGCSE/GCSE Maths, do you remember how to interpret box plots?
Box Plots
- When data is ordered:
- LQ = 1/4(n+1)
- Median = ½ (n+1)
- UQ = 3/4(n+1)
- Interquartile range = UQ - LQ
- Positive skew = when median is closer to LQ than UQ
- Negative skew = when median is closer to UQ than LQ
- Symmetrical distribution = even spread from LQ to UQ
- Outlier = does not fit the trend, or more than 1.5x the interquartile range below LQ/above UQ
That's the end of the topic!
Drafted by Bonnie (Mathematics)