Title: Oct 20 ­ 10:29 (1 of 25)
To find out the most popular flavour of
crisps in your school.
You cannot ask everyone so you ask a
fraction of the school population
This fraction of the population is called a
sample
the sample could be your class.
The sample size is the number of pupils
that you ask.
Title: Oct 20 ­ 10:36 (2 of 25)
Question
Choose your favourite flavour of
crisp from the following list?
salt and vinegar, cheese and onion, plain,
tomato, beef and prawn cocktail
Title: Oct 20 ­ 10:41 (3 of 25)
Title: Oct 20 ­ 10:10 (4 of 25)
Total:
Title: Oct 20 ­ 10:18 (5 of 25)
Pictograms
Title: Oct 20 ­ 12:14 (6 of 25)
Bar Graphs
• Be careful to interpret scales
correctly
• Bars should be the same width
• Bars may be horizontal or vertical
• The height of the bar gives its
frequency (how many)
• The order of the bars may not be
important
Title: Oct 20 ­ 10:45 (7 of 25)
Number
of
Pupils
Salt Cheese
&
&
Vinegar Onion
Title: Oct 20 ­ 12:04 (8 of 25)
Plain
Tomato
Beef
Prawn
Cocktail
Number
of
Pupils
Salt Cheese
&
&
Vinegar Onion
Title: Oct 20 ­ 11:59 (9 of 25)
Plain
Tomato
Beef
Prawn
Cocktail
Number
of
Pupils
Salt
&
Vinegar
Title: Oct 20 ­ 13:45 (10 of 25)
Cheese
&
Onion
Plain
Tomato
Beef
Prawn
Cocktail
Title: Oct 26 ­ 21:26 (11 of 25)
Frequency Polygons
Title: Oct 20 ­ 15:14 (12 of 25)
Number
of
Pupils
81-90
71-80
Title: Oct 20 ­ 15:22 (13 of 25)
61-70
51-60
41-50
31-40
21-30
11-20
1-10
Mark (%)
Number
of
Pupils
81-90
71-80
Title: Oct 20 ­ 20:24 (14 of 25)
61-70
51-60
41-50
31-40
21-30
11-20
1-10
Mark (%)
Number
of
Pupils
81-90
71-80
Title: Oct 20 ­ 20:27 (15 of 25)
61-70
51-60
41-50
31-40
21-30
11-20
1-10
Mark (%)
Pie Charts
Useful for comparing categories
Title: Oct 20 ­ 20:29 (16 of 25)
Cat or Dog
Title: Oct 20 ­ 22:02 (17 of 25)
Rabbit, Hamster or Guinea Pig
Title: Oct 20 ­ 22:13 (18 of 25)
Favourite Pet
Title: Oct 20 ­ 22:19 (19 of 25)
Line Graphs
Useful for showing trends
Title: Oct 20 ­ 22:21 (20 of 25)
Tuck shop sales
Draw a line graph to represent the
tuck sop sales.
Comment upon what is shown
Title: Oct 26 ­ 21:59 (21 of 25)
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Title: Oct 26 ­ 21:59 (22 of 25)
mon tue wed thu fri
Title: Oct 26 ­ 22:01 (23 of 25)
Title: Oct 26 ­ 22:08 (24 of 25)
Title: Oct 26 ­ 23:01 (25 of 25)