# Maths unit 3&4

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1. Types of data
• Categorical: Ordinal, nominal
• Numerical: Discrete, continuous
2. Categorical
A category is recorded when the data is collected.
3. Numerical
• When data is collected a number is recorded. There are two types
• Discrete: The numbers are distinct values, often whole numbers and usually the data comess from counting.
• Continuous: Any number on a continuous number line is recoded; usally the data is produced by measuring to any desired level of accuracy.
4. Bar chart
Categorical data
5. Mode
The most frequently occuring value or category.
6. Segmented bar chart & Percentage segmented bar chart
Categorical data
7. Histogram
• Continuous data
• Columns are joined together
8. Column graph
• Discrete data
• Equal width with spaces between
9. Symmetrical
Same shape either side of the centre
10. Positively skewed
Tails off to the right
11. Negatively skewed
Tails off to the right
12. Outliers
Extreme values, well away from the majority of data, should be considered.
13. Range
largest value - smallest value
14. Stemplot
discrete data
15. Median
• O2
• The middle value when the data is ordered
• (n+1/2)
16. The interquartile range
• IQR
• Q3 - Q1
• Q3= the midpoint of the upper half
• Q1= the midpoint of the lower half
17. Box plot
• Minimum
• Q1
• median
• Q3
• maximum
18. Mean
• αΊ‹
• The average
• mean= sum of data values/ total number of data values
19. 68%
one standard deviation of the mean
20. 95%
two sd of the mean
21. 98%
three sd of the mean

## Card Set Information

 Author: bridgit ID: 66966 Filename: Maths unit 3&4 Updated: 2011-02-17 09:54:06 Tags: further maths Folders: Description: study notes for further maths units 3&4 Show Answers:

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