Scatterplots and lines of good fit
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Log in to continueDescribe the strength, direction and shape of a numerical relationship and use a fitted line carefully.
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A proposed line of good fit is y = 2x + 1. What does it predict at x = 2?
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Answer: 5
- Substitute x = 2.
- y = 2×2+1 = 5.
- A fitted line predicts a typical value; individual observations may differ.
- 2 × 2 = 4.
- 4 + 1 = 5.
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Curriculum reference
Victorian Curriculum F–10 Version 2.0
Pi Leo practice scope
Describe the strength, direction and shape of a numerical relationship and use a fitted line carefully.
Read the official VCAA curriculum description (VC2M10ST02)
These quizzes practise concepts within this topic. Multiple-choice answers alone do not demonstrate drawing, conducting an investigation or using a digital tool.
Activities to practise beyond the quiz
- Supported by the guided activity; selecting an MCQ does not demonstrate this action.
- Supported by the guided activity; selecting an MCQ does not demonstrate this action.
- VC2M10ST02-C01Calculate a prediction and recognise its uncertainty.
- VC2M10ST02-C02Construct a scatterplot and choose or draw a line of good fit.
- VC2M10ST02-C03Use direction, strength and linearity accurately.
- VC2M10ST02-C04Construct and interpret scatterplots with different kinds of association.
- VC2M10ST02-C05Apply and explain scatterplots and lines of good fit using read and connect representations.
- VC2M10ST02-C06Apply and explain scatterplots and lines of good fit using calculate and explain each step.
- VC2M10ST02-C07Apply and explain scatterplots and lines of good fit using build and check a model.
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Subskills
These practice subskills map to the curriculum topic. Guided activities cover skills beyond multiple-choice questions.
Descriptor-derived subskills
- D01Use a fitted lineCalculate a prediction and recognise its uncertainty.
- D02Describe the patternUse direction, strength and linearity accurately.
- D03Read and connect representationsApply and explain scatterplots and lines of good fit using read and connect representations.
- D04Calculate and explain each stepApply and explain scatterplots and lines of good fit using calculate and explain each step.
- D05Build and check a modelApply and explain scatterplots and lines of good fit using build and check a model.