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**Scatter Plots – Age and Reaction Time**

By: Heather, Robyn & Ryan

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**http://www.youtube.com/watch?v=9Iw3a_ LtJVE**

Digital Resource 1 LtJVE

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**Overview 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.

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**Declarative & Procedural Knowledge**

Declarative 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.

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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.

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**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 28 0.45 32 38 0.46 42**

48 0.47 52 58 0.48 62 0.50 68 0.52

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**Age vs. Braking reaction time (Stopping a car)**

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**Age vs. Braking reaction time (Stopping a car)**

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**What Relationship is this?**

Does the increase in temperature impact sunscreen sales? What do you think this scatter plot would look like?

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**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?

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**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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**Visit our wiki to find out more http://mathshrr.wikispaces.com**

Thank you

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