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Range = largest
When working with
statistical diagrams, data value ­
make sure you look at smallest data
the scale carefully!
value.


Grouping data is good Mode = most
because it makes the data
easier to calculate with and common value.

interpret.
Modal class = group
However, by grouping we…

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The interquartile range is the
Interquartile range range of the middle 50% of the
data. It is the length of a box on a
= box plot


upper quartile ­ Interquartile range calculations
tend not to include anomalies for
lower quartile this reason interquartile range is
more accurate than range.…

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Mean From A Grouped
Frequency Table
USE MIDPOINTS
Total the midpoint x
frequency ; divide by total
frequency
GROUP FREQUENCY MIDPOINT MIDPOINT
x
FREQUENC
Y
0-2 5 1 5
3-5 4 4 16
6-10 3 8 24
11-15 3 13 39
TOTAL 15 84
MEAN = 84/15 = 5.6
RELATIVE…

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To find median on a cumulative frequency, On a histogram plot frequency
draw a line at halfway up the cumulative density on y axis where
frequency and see where it meets the curve.
Lower quartile same but ¼ of way up Frequency density = Frequency
Upper quartile same but ¾…

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GROUP FREQUENCY
A POSITIVE CORRELATION
B NO CORRELATION
0 C NEGATIVE CORRELATION 2 D NO CORRELATION 4 6 TOTAL 20
The modal class interval is the one with
highest frequency: 0 The median class interval is the one
with the ½ (20+1)th value in it; 10.5th…

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A sample should
consider things like On a scatter
the different diagram, always
genders, ages and draw a line of
cultures
appropriately.
best fit!




When plotting a
When plotting a cumulative frequency
frequency curve use
polygon use ENDPOINTS and join
with a SMOOTH
MIDPOINTS CURVE OR LINE.
Systematic
To be…

Page 7

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with some given
order.
A data collection sheet To write a suitable
should include a column for question, think:

title of object being
measured, a column for Are all responses
tally and a column for covered?
frequency e.g. Do you need to give a time
frame?
MAKE SURE
RESPONSES DON'T…

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A sample space diagram
shows all possible outcomes,
e.g. adding the scores of 2
dice If the question asks you
+ 1 2 3 4 5 6
1 2 3 4 5 6 7 for a probability of both
2 3 4 5 6 7 8 or one of or…

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In tree diagrams, Multiply along, add Mutually exclusive events are events which can't
between. happen together.

In tree diagrams each branch adds up EXAMPLE: You can't get a 1 on a dice and an
to 1. even number at the same time!
In tree diagrams final probabilities (the
P(1 and…

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jakepearson

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very useful

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