Statistics Revision Guide Part 1 By S Satish

This is just basically part 1 of the Stats Revision Guide that I will be putting up and it when the whole series is up youll know all you need to know the exam which is on the 25th of June 2010

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  • Created by: S Satish
  • Created on: 19-06-10 12:41
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By Shruti Satish
GCSE Statistics
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Slide 2

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Types of data
Bivariate Data is data which
consists of 2 different variable
Quantitative Data is numerical
Qualitative Data is non-numerical
Discrete Data is specific numbers
along a scale for example shoe sizes
you are either a 6 or a 7 but you cant
be a 6.5469
Continuous Data is any number
along the scale for example weight
or length can be like 3.244kg
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Slide 3

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Types of data 2
Primary Data Secondary Data
? Data you collect You use someone
yourself E.g. else's data. E.g. get it
interview people off the internet
Pros Data which you It is easier just to
collect yourself use data
so you know its It is much more
source quicker
You can ensure It is cheaper
there are no
anomalies or
You can make
it less bias
Cons It is time You do not know its
consuming source
It can be The data could be
expensive made up
It can be It may contain
difficult to collect anomalies
the data by The data may be
yourself biased
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Slide 4

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Population is everybody/thing that
could be involved in your
Census is the information on
everyone/thing in the population
Sample is taking information from
part of the population to make
conclusions on the whole population
Random Sample is when each
person/thing in the population has an
equal chance of selection and is
selected randomly
Stratified Sampling is when the
proportion of groups in a sample is
the same as the proportion of
No. inin
of people the population
No. of people in
x Size of total sample
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Slide 5

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Question Time!
There are 36 blue balls and 29 red
balls and 17 yellow balls and 18
green balls. So if you wanted to take
a stratified sample of 25 balls then
how many of each would you take in
your sample?
Blue = x 25 =9
Red = x 25 =7.
100 25
17 (or
Yellow x 25 7)
= 100 25
18 (or
Green x 25 4)=4.5
= 100
Get that right?
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Slide 6

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Systematic Sampling is when you
choose people at regular intervals of
an unordered list. You select ever Xth
Sample Size
Question Time
There are 500 birds in the population
and you want to take a sample of 20
birds. So what intervals would you use
to select
500 the birds?
= 25
You would use intervals of 25 birds and you
would select every 25th bird
Get that right?
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Slide 10

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Great presentation, really helped x Thanks x

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