S1 Statistics Revision - Chapter 3 Notes

Chapter 3 - Methods for summarising sample data (location)

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AS Statistics Revision
Statistics 1 ­ Chapter 3
Methods for summarising sample data (location)
Key points to remember
Mode = the value of a variable that occurs most frequently
Median = the middle value of an ordered set of data.
Quartiles = Divide the data into four equal parts:
25% of the observations are less than or equal to the first
quartile = (n ÷ 4)
50% of the observations are less than or equal to the
second
quartile or median = (n ÷ 2)
75% of the observations are less than or equal to the third
quartile = (3n ÷ 4)
Deciles ­ Divide the data into 10 equal parts
Percentiles ­ Divide the data into 100 equal parts
Box Plot ­ used to represent data and allows comparisons
Smallest Value Largest Value
Q1 Q2 Q3
Population = a collection of individual items or individuals.
Sample = a subset of a population used to represent that
population
Mean = the sum of all observations divided by the total
number
of observations:
x = (x ÷ n) or (fx ÷ f)
Coding = transforms a variable into a simpler one and makes

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