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===Meaning===
A '''scatter graph''' is a graph that can be used to make predictions from an [[experiment]].
===About Scatter Graphs===
: '''Scatter graphs''' use x's to plot points on the graph.
: A single line is drawn on a '''scatter graph''' called a [[Line of Best Fit|line of best fit]].
: The variable you change in the experiment goes on the [[x-axis]].
: The variable you measure or count goes on the [[y-axis]].
===Plotting a Scatter Graph===
{| class="wikitable"
|+ In this experiment a scientist watered 6 different pots of cress with different amounts of water each day to see how the amount of water affects the growth of cress.
|-
|[[File:ScatterGraphTable1.png|center|400px]]
|[[File:ScatterGraphPt1.png|center|400px]]
|-
| style="height:20px; width:400px; text-align:center;" |Use the results table to find the highest number. (On this table it's 16).
| style="height:20px; width:400px; text-align:center;" |Amount of water was chosen to it goes on the x-axis and the height of the stem goes on the y-axis. Add the numbers on the axes up to the highest number.
|-
|[[File:ScatterGraphPt2.png|center|400px]]
|[[File:ScatterGraphPt3.png|center|400px]]
|-
| style="height:20px; width:400px; text-align:center;" |Plot the points on the graph using an X at each point.
| style="height:20px; width:400px; text-align:center;" |Draw one straight [[Line of Best Fit|line of best fit]] to the graph.
We can use this line to predict that the stem would have grown 8mm if we'd given it 25ml of water each day.
|}
===Experiments for Scatter Graphs===
'''Air Resistance and Weight'''
: Time how long it takes a single Cupcake case to fall from the ground from 1.5 metres high.
: Repeat this for two, three, four and five cupcake cases stacked together.
: This changes the weight without changing the shape of the object.
: If the difference is too small for meaningful results try 2, 4, 6, 8 and 10 cases.
: Plot the results on a [[Scatter Graph]] (not a line graph or bar chart).
'''Air Resistance and Size'''
: Cut several different size parachutes from bin liners.
: Ensure that the surface area of each parachute increases by the same amount each time. This can support math skills calculating area of shapes.
: Use string to attach the parachutes to the same piece of plastacine each time.
: Plot the results on a [[Scatter Graph]] (not a line graph or bar chart).
==Key Stage 3==
===Meaning===
A '''scatter graph''' is a [[graph]] that can be used to show [[correlation]]s between two [[variable]]s.
===About Scatter Graphs===
: The [[Independent Variable|independent variable]] is plotted on the [[x-axis]].
: The [[Dependent Variable|dependent variable]] is plotted on the [[y-axis]].
: '''Scatter graphs''' use x's to plot points on the [[graph]].
: A single line is drawn on a '''scatter graph''' called a [[Line of Best Fit|line of best fit]].
: The [[Line of Best Fit|line of best fit]] may be a straight line or a curved line that shows a trend in the data.
===Examples===
{| class="wikitable"
|-
|[[File:ScatterGraphStraight.png|center|300px]]
| style="height:20px; width:300px; text-align:center;" |This '''scatter graph''' shows a [[Positive Correlation|positive correlation]] with a straight [[Line of Best Fit|line of best fit]] which goes through zero, showing the relationship is [[Directly Proportional|directly proportional]].
|}
==Key Stage 4==
===Meaning===
A '''scatter graph''' is a [[graph]] that can be used to show [[correlation]]s between two [[variable]]s.
===About Scatter Graphs===
: The [[Independent Variable|independent variable]] is plotted on the [[x-axis]].
: The [[Dependent Variable|dependent variable]] is plotted on the [[y-axis]].
: '''Scatter graphs''' use x's to plot points on the [[graph]].
: A single line is drawn on a '''scatter graph''' called a [[Line of Best Fit|line of best fit]].
: The [[Line of Best Fit|line of best fit]] may be a straight line or a curved line that shows a trend in the data.
===Examples===
{| class="wikitable"
|-
|[[File:ScatterGraphStraight.png|center|300px]]
|[[File:ScatterGraphCurve.png|center|300px]]
|-
| style="height:20px; width:300px; text-align:center;" |This '''scatter graph''' shows a [[Positive Correlation|positive correlation]] with a straight [[Line of Best Fit|line of best fit]] which goes through zero, showing the relationship is [[Directly Proportional|directly proportional]].
| style="height:20px; width:300px; text-align:center;" |This '''scatter graph''' shows a [[Negative Correlation|negative correlation]] with curved [[Line of Best Fit|line of best fit]] showing the relationship is [[Inversely Proportional|inversely proportional]].
|}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Scatter graphs, page 268, GCSE Chemistry; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Scatter graphs, pages 263, 281, GCSE Physics; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Scatter graphs, pages 56, GCSE Combined Science Trilogy 2, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Scatter graphs; Correlation, pages 115-16, GCSE Combined Science Trilogy 2, Hodder, AQA '']
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Scatter graphs, page 288, Gateway GCSE Biology, Oxford, OCR '']