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Unit 1 GCSE Maths- Edexcel
by Rachel Mander
Methods of Sampling
See sheet attached to this page.
Random samples:
Names in a hat
Numbered participants- random numbers for each item, computer generated
Each item has an equal chance of being selected
Check sample size
Check the time of when…

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Add up data, divide by how many values
Most common
Most occurring value
Middle in range
Middle value once ordered
Difference between highest and lowest.

Raw Data Frequency Table Grouped Frequency Table
No. Of TVs
1, 5, 2, 3, 2, 3, 2,
3, 5 ,0, 2,…

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= 1628
Average= 2580 (no. Of points)
36 (no. In group)

The Quartiles split the data into four sections, each containing the same number of pieces of data. This
enables us to see how spread the data is.
In General:
Lower Quartile: 1 n n= the number of…

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Box Plot

Outliers are values more than 1.5 times the interquartile range away from the nearest quartile.
If spread out more at lower end and clustered and the top it is a negative skew.
Vice versa is a positive skew.
It spread out equally, it is symmetrical.

Cummulative Frequency Diagram…

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Stem and Leaf
A maths test is marked out of 50. The marks for the class are shown below:
7, 36, 41, 39, 27, 21
24, 17, 24, 31, 17, 13
31, 19, 8, 10, 14, 45
49, 50, 45, 32, 25, 17
46, 36, 23, 18, 12, 6…

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This information is given to us in the Key. Remember the Key
It is usual for the numbers to be ordered. So, for example, the row

shows the numbers 21, 23, 24, 24, 25 and 27 in order.
Shows graphically the median group. Count in for median and mean you…

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From the tree diagram, we can see that there are eight possible outcomes. To find out the probability of
a particular outcome, we need to look at all the available paths (set of branches).
The sum of the probabilities for any set of branches is always 1.
Also note that…

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Bar Graph
Discrete data. Gaps in between, separate figures, block labelled.
Continuous data. No gaps. Range given, lines labelled. Individual bars are not labelled because the data is
continuous. Doesn't have to start at 0. To find the amount of people in half of a bar multiply the…

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