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Where will you view the Torch Relay?
Getting to the Point in 2012
© Royal Statistical Society Centre for Statistical Education 2011
Plan Collect Process Discuss
Start screen
What is the Olympic Torch Relay?
Where is the Olympic Torch going?
How can you find out?
When did the Olympic Games last take place in the UK?
The first Olympic Games after the end of the Second World War were held in London in the summer of 1948.
There was an Olympic Torch Relay that started in Athens and carried the flame across Europe to the UK.
The Olympic Torch landed in Dover and was carried in relay to the Wembley Stadium in London.
Plan Collect Process Discuss
Start screen
Why is there an Olympic Torch Relay?
When was the Olympic Torch Relay last in the UK?
When was the most recent Olympic Torch Relay?
Discuss
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Collect
DHCycle
The Statistical Problem Solving Approach
You can build on the first try by
continuing here...
Have you got all the evidence
you want?
First you decide what problem to
solve and what data you need
Then you collect suitable data.
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DHCycleThe Problem Solving Approach
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Start screen
Where is the Olympic Torch visiting?
Is our school
near to th
e
Olympic Torch
Relay?
PlanDistance by road or as
the crow flies?Distance from your
home?
How do road and flight distances compare?
Where will you view the Olympic Torch Relay?
Collect Process DiscussPlan
Plan
Is there a relationship between the road and crow flight distances between two locations?
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Plan
In Cornwall
An example using a random sample of schools in Cornwall.
For this example the data is provided.
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How to find the distances
Crow flight distanceRoad
distance
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Data for a random sample of Cornwall schools
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DHCycle The Problem Solving Approach
You arenow here.
ProcessPlan Collect Discuss
Mean?Standard
Deviation?
Median?Interquartile
Range?
Graph or statistic?
ProcessPlan Collect Discuss
Statistic KeyCrow flight distance between two
locations (miles)Road distance between two
locations (miles)
Minimum Value Min 0.00 0.00Quartile 1 Q1 0.90 1.13Median Value (Quartile 2) Med 3.20 4.30Quartile 3 Q3 6.80 9.45Maximum Value Max 26.20 35.70
Total distanceRoad 246.6 milesCrow 191.5 miles
What are the distances like?(In Excel)
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Variable N Mean Min Q1 Median Q3 MaxRoad 40 6.17 0.00 1.13 4.30 9.45 35.70Crow 40 4.788 0.000 0.900 3.200 7.000 26.200
Total distanceRoad 246.6 milesCrow 191.5 miles
What are the distances like?In Minitab
Road Distance (miles)Crow Flight Distance (miles)
40
30
20
10
0
Crow Flight Distances (miles) and Road Distance (miles) in Cornwall
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St Pedroc’s SchoolBudeEX23 8NJ
Direct distance 26.2 milesRoad distance 35.7miles
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How much further by road?
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How much further by road?
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How much further by road?
How can we look at the relationship between the crow flight and road distances for this sample of schools?
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Is there a relationship between crow flight and road distance?
The first school has crow distance = 9.8 and road distance = 13.1 miles.All the schools can be plotted on this graph.
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Line of best fit
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Use the graph to predict road distance using crow flight distance
Crow flight distance15 miles
Road distanceabout 19 miles
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Road distance = 1.31 Crow flight distance – 0.09
Find the equation of the line of best fit using Excel.
ProcessPlan Collect Discuss
Find the equation of the line of best fit from the scatter plot.
25.0 miles
32.5 miles
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We can predict road distance from crow flight distance using the equation of the line of best fit.
Road distance = 1.31 × Crow flight distance + - 0.09 (Y variable = gradient × X variable + intercept)
Using the equation above find the road distance for a crow flight distance of 15 miles.
Road distance = 1.31 x Crow flight distance – 0.09
= 1.31 x (15) - 0.09 = 19.65 – 0.09 = 19.6 miles
ProcessPlan Collect Discuss
Interpreting the line of best fit.
Road distance = 1.31 × Crow flight distance + - 0.09
Gradient ~ for every mile travelled by crow flight we would expect to travel 1.3 miles by road.
Intercept ~ if we travel zero miles by crow flight we would expect to travel -.09 miles by road.
Does this make sense in real life?
ProcessPlan Collect Discuss
Based on the analysis in this lesson which one of the following statements is correct?
a) It is 31 % longer to travel between two locations by road rather than by crow flight.
b) In Cornwall it is 31 % longer to travel between two locations by road rather than by crow flight.
c) On average in Cornwall for every mile travelled by crow flight we would expect to travel 1.3 miles by road.
d) On average in Cornwall for every mile travelled by crow flight we would expect to travel 1.3 miles by road for distances less than 25 miles.
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DHCycle The Problem Solving Approach
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DiscussionAre there any issues with the graphs created fromthe distances?
Were there any patterns linking crow flight distance and road distance in Cornwall?
How do your class results relate to Cornwall data?
Would you expect a graph of road distance against crow flight distance to look the same wherever pupils live?
Would you expect a graph of road distance against crow flight distance to look the same for Scotland?
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Process
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Collect
DHCycle The Problem Solving Approach
You arenowhere.
You can develop another solution by continuing here...
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CollectEnd ofslideshow