Starter quiz
Which point on the graph has the coordinates (3, 8)?- A ✓
- B
- C
- D
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- What are the coordinates of Point C in this graph?
- '(3, 2)' ✓
- Which is another term to describe the independent variable in bivariate data?
- dependent variable
- explanatory variable ✓
- response variable
- series
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- A ______ graph is a visual representation for bivariate data, which can be useful when determining the nature of the relationship between the variables.
- 'scatter' ✓
- A set of bivariate data measures the length of an obstacle course and the time it takes for people to complete it. Which variable is most likely to be the dependent variable?
- length of obstacle course
- time taken to complete the course ✓
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- A set of bivariate data measures the length of an obstacle course and the time it takes for people to complete it. Which variable should go on the horizontal axis of a scatter graph?
- length of obstacle course ✓
- time taken to complete the course
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Exit quiz
The scatter graph show minimum and maximum temperatures for different months in a town. Which statement best describes the trend in the data?- Months with higher minimum temperature have higher maximum temperatures. ✓
- Months with higher minimum temperature have lower maximum temperatures.
- There is no connection between the variables.
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- Which scatter graphs shows a case where as one variable increases the other variable tends to decrease?
- Look at the scatter graph. A new month records a minimum temperature of 10 degrees Celsius. Which range could we expect the maximum temperature to be in?
- 4 to 6 degrees Celsius
- 8 to 11 degrees Celsius
- 14 to 17 degrees Celsius ✓
- 19 to 21 degrees Celsius
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- Look at the scatter graph. A new month records a maximum temperature of 10 degrees Celsius. Which range could we expect the minimum temperature to be in?
- 4 to 6 degrees Celsius ✓
- 8 to 11 degrees Celsius
- 14 to 17 degrees Celsius
- 19 to 21 degrees Celsius
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- ______ is the process of estimating unknown values that are inside the range of existing data.
- 'interpolation' ✓
- Which statement is true?
- Extrapolation is more reliable than interpolation for estimating data.
- Interpolation is more reliable than extrapolation for estimating data. ✓
- Extrapolation and interpolation are equally reliable for estimating data.
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Scatter graphs can be used to find a second value when the first value is known.
- A general trend may be observed from a scatter graph.
- Extrapolation may not be valid as this is outside the data set.
Common misconception
Pupils may assume that all there is always a connection between variables in scatter graphs.
Emphasise examples showing no/weak connections, but explain that the tasks use data containing stronger connections for purpose of practice.
Keywords
Interpolation - Interpolation is the process of estimating unknown values that are inside the range of existing data.
Extrapolation - Extrapolation is the process of estimating unknown values that are outside the range of existing data.
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