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Year 8 - Science

Continuous variation: data handling and analysis

Variation (differences within species)

Unit Summary

This unit examines variation within species, both continuous and discontinuous, using measurements and graphical representations. It also emphasises objectivity, accuracy, precision, and repeatability in investigations, the use of appropriate techniques, and the effective presentation of data.

Lesson Summary

You will learn to plot data on continuous variation on a histogram and suggest possible causes for the variation.

Key Notes

  • Using a histogram or line graph to display continuous data.
  • Plotting data for continuous variation on a histogram.
  • Interpreting and describing a histogram displaying data for continuous variation.
  • Continuous variation is usually influenced by many factors, including genetics, the environment and lifestyle.

Vocabulary To Learn

  • continuous variation: Variation which can take any one of many values over a continuous range.
  • line graph: A graph displaying continuous data plotted as points joined with a line.
  • histogram: A graph displaying continuous data grouped into ranges and plotted as columns that touch.
  • environment: Factors in an organism's surroundings that influence its features.
  • genetic: Related to the genetic material (DNA) and genes that an individual has.

Common Mistakes To Avoid

  • Using a bar chart to plot continuous data. Features with continuous variation are only due to genetic factors.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

Using a histogram or line graph to display continuous data. Plotting data for continuous variation on a histogram.

2. Define this scientific word and use it in context. 'continuous variation'

Variation which can take any one of many values over a continuous range. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Using a bar chart to plot continuous data. Features with continuous variation are only due to genetic factors. Correction: The lesson explores why a histogram or line graph is the correct choice for plotting discontinuous data, and the idea that continuous variation is usually influenced by many factors, including genetics, the environment and lifestyle.

More Lessons In This Unit

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