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1
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2
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- Trends in data
- Scatter plots and correlation
- Interpolation estimating variation within the observed range
- Extrapolation predicting variation beyond the observed range
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3
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- Trends may be discerned best from graphs.
- Both interpolation and extrapolation are used.
- General trends are expected to continue.
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4
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- The relationship, if any, between two variables is called correlation.
- A scatter diagram may reveal correlation.
- Correlation may vary from –1 to +1.
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5
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6
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7
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- Interpolation
- Relies on reading the graph correctly (skill ID1)
- Extrapolation
- Requires the assumption that any observed trends will continue
- Relies on reading the graph correctly (skill ID1)
- The scale(s) of the graph may have to be extended
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Notes