Scatter Plots – Age
and Reaction Time
By: Heather, Robyn & Ryan
Digital Resource 1
http://www.youtube.com/watch?v=9Iw3a_
LtJVE
Overview
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Declarative and procedural knowledge.
Defining the Key terms.
Why do we use scatter plots?
Time for you to create a scatter plot.
Using a scatter plot to make predictions.
Quick quiz
Mathematical worth of additional three
digital resources.
Declarative & Procedural Knowledge
Declarative Knowledge
• Key terms:scatter plot (scatter diagram),
line of best fit, trend line,
positive and negative
relationship/correlation;
Bivariate data;
• Appropriate use of graphs and
how to apply this learning.
• How to read and interpret the
various patterns and variables
of a scatter plot.
• Identify scatter plot trends
and make predictions
Procedural Knowledge
• Identify uses for scatter
plots.
• Create a scatter plot.
• Interpret authentic data to
draw conclusions.
• Analyse data and recognise
patterns.
Definitions
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Scatter Diagram – A graph of plotted points that show the
relationship between two sets of data.
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Correlation – When the two sets of data are linked
together; Co (meaning ‘together’), and Relation.
◦ You will also see the words, Relationship and association.
Definitions
Positive Correlation – When the values
increase together.
 Negative Correlation – When one values
decrease and the other increases.
 No Correlation - Where a change in one
set of data has no effect on the other set.
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Definitions
Line of best fit – To find the direction of a
correlation between two variables.
 Trend line - A line on a graph indicating a
statistical trend
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Definitions
Bivariate data - a set up of data made up
of two variables.
 For example, comparing height to weight
or age to reaction time.
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Scatter Plot Data:
Age
Reaction Time
18
0.43
22
0.43
28
0.45
32
0.45
38
0.46
42
0.46
48
0.47
52
0.47
58
0.48
62
0.50
68
0.52
Age vs. Braking reaction time
(Stopping a car)
0.54
0.52
0.5
0.48
Reaction Time
0.46
0.44
0.42
5
15
25
35
45
55
65
75
Age vs. Braking reaction time
(Stopping a car)
0.54
0.52
0.5
0.48
Reaction Time
Line of Best fit
0.46
0.44
0.42
5
15
25
35
45
55
65
75
What Relationship is this?

Does the increase in temperature impact
sunscreen sales? What do you think this
scatter plot would look like?
What Relationship is this?
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If the price of bananas increase does this
effect the amount of bananas sold? What
would this scatter plot relationship look
like?
What Relationship is this?
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If we plotted how old you are, and the
results you got for your maths test, what
correlation is there?
Visit our wiki to find out more
http://mathshrr.wikispaces.com
Thank you