Scatter Plots – Age and Reaction Time

By: Heather, Robyn & Ryan

Digital Resource 1http://www.youtube.com/watch?v=9Iw3a_LtJVE

OverviewDeclarative 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 quizMathematical worth of additional three

digital resources.

Declarative & Procedural KnowledgeDeclarative Knowledge Procedural 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

• Identify uses for scatter plots.

• Create a scatter plot.• Interpret authentic data to

draw conclusions. • Analyse data and recognise

patterns.

Definitions Scatter Diagram – A graph of plotted points that show the

relationship between two sets of data.

Correlation – When the two sets of data are linked together; Co (meaning ‘together’), and Relation.◦ You will also see the words, Relationship and association.

DefinitionsPositive 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.

DefinitionsLine of best fit – To find the direction of a

correlation between two variables.Trend line - A line on a graph indicating a

statistical trend

DefinitionsBivariate data - a set up of data made up

of two variables.For example, comparing height to weight

or age to reaction time.

Scatter Plot Data:Age Reaction Time

18 0.4322 0.4328 0.4532 0.4538 0.4642 0.4648 0.4752 0.4758 0.4862 0.5068 0.52

Age vs. Braking reaction time(Stopping a car)

5 15 25 35 45 55 65 750.42

0.44

0.46

0.48

0.5

0.52

0.54

Reaction TimeLine of best fit

Age vs. Braking reaction time(Stopping a car)

5 15 25 35 45 55 65 750.42

0.44

0.46

0.48

0.5

0.52

0.54

Reaction TimeLine of best fitLine of Best fit

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?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?If we plotted how old you are, and the

results you got for your maths test, what correlation is there?

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