1 markThe scatter graph shows some information about 8 cars.
For each car it shows the engine size, in litres, and the distance, in kilometres, the car travels on one litre of petrol.
What type of correlation does the scatter graph show?
2 marksA different car of the same type has an engine size of 2.5 litres.
Estimate the distance travelled on one litre of petrol by this car.
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1 markThe scatter graph shows information about the height and arm length of each of 8 students in Year 11
What type of correlation does this scatter graph show?
2 marksA different student in Year 11 has a height of 148 cm.
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1 markThe scatter graph shows some information about 10 cars, of the same type and make.
The graph shows the age (years) and the value (£) of each car.
The table shows the age and the value of two other cars of the same type and make.
| age(years) | 1 | 3.5 |
| value(£) | 8200 | 5000 |
On the scatter graph, plot the information from the table.
1 markDescribe the relationship between the age and the value of the cars.
2 marksA car of the same type and make is 
years old.
Estimate the value of the car.
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1 markThe scatter graph shows information about 10 apartments in a city.
The graph shows the distance from the city centre and the monthly rent of each apartment.
The table shows the distance from the city centre and the monthly rent for two other apartments.
| Distance from the city centre(km) | 2 | 3.1 |
| Monthly rent(£) | 250 | 190 |
On the scatter graph, plot the information from the table.
1 markDescribe the relationship between the distance from the city centre and the monthly rent.
2 marksAn apartment is 2.8 km from the city centre.
Find an estimate for the monthly rent for this apartment.
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1 markThe table shows the average temperature on each of seven days and the number of units of gas used to heat a house on these days.
| Average temperature(°C) | 0 | 1 | 3 | 9 | 10 | 12 | 13 |
| Units of gas used | 20 | 16 | 18 | 10 | 6 | 6 | 2 |
Complete the scatter graph to show the information in the table.
The first 5 points have been plotted for you.
1 markDescribe the relationship between the average temperature and the number of units of gas used.
2 marksEstimate the average temperature on a day when 12 units of gas are used.
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1 markThe scatter graph shows some information about ten pine cones from the same tree.
It shows the length and the width of each pine cone.
Describe the relationship between the length and the width of a pine cone.
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1 markThe scatter graph shows information about ten trees of the same type.
It shows the age and the diameter of the trunk of each tree.
What type of correlation does this scatter graph show?
2 marksAnother tree of the same type has a trunk with diameter 21 cm.
Estimate the age of this tree.
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1 markThe scatter graph shows information about the age and the price of each of 12 cars of the same model.
Describe the relationship between the age of a car and its price.
2 marksA different car of the same model is 
years old.
Estimate the price of this car.
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1 markThe scatter graph shows the best high jump and the best long jump for 15 boys.
Write down the type of correlation shown.
2 marksLiam has a best high jump of 166 cm
Use a line of best fit to estimate his best long jump.
...............................cm
1 markAnother boy has a best high jump of 195 cm
Give a reason why you should not use a line of best fit to estimate his best long jump.
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2 marksThe scatter graph shows the age and the price of 18 cars.
The cars are all the same make and model.
Use a line of best fit to estimate the price of a 6-year old car.
£..........................
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1 markIn a dance competition, two judges each award scores out of 30.
The scatter diagram shows the scores awarded to the first 10 dancers.
Here are the scores for the next two dancers.
| Judge A | 21 | 7 |
| Judge B | 18 | 8 |
Plot their scores on the scatter diagram.
3 marksDancers who are awarded a score of more than 20 by both judges receive a medal.
For the 12 dancers, express the ratio of medal winners to non-medal winners in its simplest form.
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1 markThe scatter diagram shows the number of people and the number of phones in each of 8 buildings.
One of the buildings contains 42 people.
Write down the number of phones in this building.
1 markWhat type of correlation is shown in the scatter diagram?
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1 mark
What type of correlation does the scatter diagram show?
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1 mark“We eat more ice cream as the temperature rises.”
What type of correlation is this?
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1 markThe scatter graph shows the maximum temperature and the number of hours of sunshine in fourteen British towns on one day.
One of the points is an outlier.
Write down the coordinates of this point.
1 markFor all the other points write down the type of correlation.
2 marksOn the same day, in another British town, the maximum temperature was 16.4°c.
Estimate the number of hours of sunshine in this town on this day.
1 markA weatherman says,
"Temperatures are higher on days when there is more sunshine."
Does the scatter graph support what the weatherman says?
Give a reason for your answer.
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1 markThe scatter diagram shows information about 12 girls.
It shows the age of each girl and the best time she takes to run 100 metres.
Write down the type of correlation.
1 markKristina is 11 years old.
Her best time to run 100 metres is 12 seconds.
The point representing this information would be an outlier on the scatter diagram.
Explain why.
1 markDebbie is 15 years old.
Debbie says,
Comment on what Debbie says.
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1 markKatie measured the length and the width of each of 10 pine cones from the same tree.
She used her results to draw this scatter graph.
Describe one improvement Katie can make to her scatter graph.
1 markThe point representing the results for one of the pine cones is an outlier.
Explain how the results for this pine cone differ from the results for the other pine cones.
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1 markA publisher checks documents for errors.
He records the number of documents that are checked each day.
He also records the total number of errors in the documents each day.
The scatter graph shows this information.
On another day 90 documents are checked.
There is a total of 17 errors.
Show this information on the scatter graph.
1 markDescribe the correlation between the number of documents checked and the total number of errors.
2 marksOne day 110 documents are checked.
Estimate the total number of errors in these documents.
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2 marksA and B are scatter graphs.
What type of correlation is shown by each graph?
Choose from
| Weak positive Strong positive Weak negative Strong negative No correlation |
Graph A................................
Graph B................................
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2 marksLee wishes to find out if there is a relationship between a person’s age and the time it takes them to complete a puzzle.
Lee decides to conduct an experiment.
She asks 12 people to complete the puzzle.
She records each person’s age and the time taken to complete the puzzle.
This scatter diagram shows the results for ten of the people in Lee’s experiment.
Here are the other two results.
| Age (years) | 47 | 60 |
| Time (seconds) | 21 | 34 |
Plot these results on the scatter diagram.
1 markWhat type of correlation is shown in the scatter diagram?
2 marksEstimate the time it would take a person aged 35 to complete the puzzle.
Show your working to justify your answer.
3 marksLee says that at least 80% of the 12 people completed the puzzle in under 30 seconds.
Is Lee correct?
Show working to support your answer.
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2 marksA travel agent records the duration and cost of the 15 flights he sold on one day.
The data for the first 13 flights are plotted on the scatter diagram.
The data for the final two flights is:
| Duration | 210 minutes | 1 hour 40 minutes |
| Cost | £130 | £80 |
Plot these flights on the scatter diagram.
1 markThe cost of one of the 15 flights had been discounted in a sale.
Circle the most likely flight on the scatter diagram.
1 mark1 markExplain why the travel agent should not use his records to estimate the cost of a 7 hour flight.
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2 marksThe table shows the ages and values of 11 cars of the same model.
| Age (years) | 4 | 7 | 11 | 1 | 9 | 10 | 4 | 3 | 7 | 8 | 12 |
| Value (thousands of pounds) | 9.2 | 6.0 | 1.2 | 11.4 | 2.3 | 4.2 | 3.4 | 8.0 | 5.6 | 5.0 | 0.4 |
The points for the first 7 cars are plotted on the scatter diagram.
Plot the points for the remaining 4 cars.
2 marksDescribe the type and strength of the correlation shown in the completed scatter diagram.
1 markOne car lost its value more quickly than the other cars.
On the scatter diagram, draw a circle around the point representing this car.
2 marksBy drawing a line of best fit, estimate the value of a car that is 6 years old.
£ .......................................................
1 markExplain the limitations of using the equation of the line of best fit to estimate the value of a car that is 16 years old.
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4 marksThe owner of a tourist attraction records the amount of rainfall, in millimetres, and the number of visitors each day.
The results for 10 days are shown in the scatter diagram.
[1]
[2]
[1]
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2 marksAisha records the distance she runs and her average speed.
The results are shown in the scatter diagram.
The table shows the results of four more runs.
| Distance (km) | 4.2 | 5.7 | 7.1 | 8.8 |
| Average speed (km/h) | 13.4 | 11.8 | 9.8 | 8.3 |
On the scatter diagram, plot these points.
1 markWhat type of correlation is shown in the scatter diagram?
1 markOn the scatter diagram, draw a line of best fit.
1 markUse your line of best fit to estimate her average speed when she runs a distance of 6 km.
........................................ km/h
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1 markMrs Salaman gives her class two mathematics tests.
The scatter diagram shows information about the marks each student scored.
Write down the highest mark scored on test 1.
1 markWrite down the type of correlation shown in the scatter diagram.
1 markDraw a line of best fit on the scatter diagram.
1 markHamish scored a mark of 40 on test 1.
He was absent for test 2.
Use your line of best fit to find an estimate for his mark on test 2.
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1 markTen athletes compete in both the 100 metre race and the triple jump.
Their results are shown in the scatter diagram.
One of these athletes jumps 15.12 m in the triple jump.
Write down his time for the 100 metre race.
.................................................. s
1 markThe values for two other athletes are shown in the table.
| Distance in the triple jump (m) | 14.74 | 15.2 |
| Time for 100 m (seconds) | 13.2 | 12.76 |
On the scatter diagram, plot these points.
1 markOn the scatter diagram, draw a line of best fit.
1 markWhat type of correlation is shown in the scatter diagram?
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1 markThe scatter diagram shows the value, in thousands of dollars, of eight houses in 1996 and the value of the same houses in 2016.
One of these eight houses had a value of $70 000 in 1996.
Write down the value of this house in 2016.
$ ................................................
1 markThe values of two more houses are shown in the table.
| Value in 1996 ($ thousands) |
 |
 |
| Value in 2016 ($ thousands) |
|
 |
On the scatter diagram, plot these values.
1 markOn the scatter diagram, draw a line of best fit.
1 markAnother house had a value of $50 000 in 1996.
Find an estimate of the value of this house in 2016.
$ ................................................
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3 marksThe scatter diagram shows the physics mark and the chemistry mark for each of 12 students.
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1 markA delivery driver records for each delivery the distance he drives and the time taken.
The scatter graph shows this information.
For another delivery he drives 22 kilometres and takes 50 minutes.
Show this information on the scatter graph.
1 markWhat type of correlation does the scatter graph show?
2 marksThe driver has to drive a distance of 10 km for his next delivery.
Estimate the time taken for this delivery.
1 markDuring one of the deliveries, the driver was delayed by road works.
Using the graph write down the time taken for this delivery.
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1 markThe scatter diagram shows information about 10 students.
For each student, it shows the number of hours spent revising and the mark the student achieved in the Spanish test.
One of the points is an outlier.
Write down the coordinates of the outlier.
2 marksFor all the other points
1 markA different student studies for 9 hours.
Estimate the mark gained by this student.
1 markThe Spanish test was marked out of 100
Lucia says,
Comment on what Lucia says.
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3 marksIn a survey, the outside temperature and the number of units of electricity used for heating were recorded for ten homes.
The scatter diagram shows this information.
Molly says,
Is Molly right?
Show how you get your answer.
1 markYou should not use a line of best fit to predict the number of units of electricity used for heating when the outside temperature is 30 °C.
Give one reason why.
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1 mark12 students take two tests.
Each test is out of 60.
The scatter diagram shows the results for 10 of the students.
The table shows the results for the other 2 students.
| Test 1 | 36 | 38 |
| Test 2 | 44 | 41 |
Plot these results on the scatter diagram.
1 markDescribe the type of correlation shown in the scatter diagram.
1 mark4 marksWork out the percentage of the 12 students whose result on Test 1 is lower than their result on Test 2.
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2 marksThe scatter diagram shows the results of 17 students in their French test and their German test.
Both tests are out of 100.
Here are the results of another 4 students.
| French | 21 | 75 | 48 | 53 |
| German | 30 | 78 | 46 | 61 |
Plot these results on the scatter diagram.
2 marksDescribe the type and strength of the correlation shown in this diagram.
4 marksWork out the percentage of the students whose German result was higher than their French result.
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