# Interpreting and drawing real-life graphs

I can interpret and draw other real-life graphs.

# Interpreting and drawing real-life graphs

I can interpret and draw other real-life graphs.

## Lesson details

### Key learning points

- Not all real-life graphs can be drawn using sections of different linear graphs.
- The graphs are models, which means that we want them to be useful.
- Different containers may need different graphs to model filling them.
- Volume of liquid changes over time and this is affected by container shape.

### Common misconception

Interpolation is always more accurate than extrapolation.

If a graph is plotting data collected at set points then there is no way to know what is happening between the points. The trend between the points could be a curve, a line or could fluctuate. Interpolation could therefore be inaccurate.

### Keywords

Time series graphs - Time series graphs show data over a time period. The time period is always shown on the $$x$$-axis. Data points are joined chronologically by line segments.

Extrapolation - Extrapolation is the process of estimating unknown values that are outside the range of existing data.

Interpolation - Interpolation is the process of estimating unknown values that are inside the range of existing data.

### Licence

This content is Â© Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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