Analyse data and its source
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Log in to continueDescribe sample distributions and interpret how primary, secondary, random and non-random data were obtained.
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A random sample gives these travel times in minutes: 2, 3, 3, 4, 8. What is the sample mean? Give your answer to 2 decimal places.
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Answer: 4.00 min
- The total is 20 minutes for 5 observations.
- Mean = 20 ÷ 5 = 4.00 minutes. It describes this sample, not an exact population value.
- mean(2, 3, 3, 4, 8) = 4.
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Curriculum reference
Victorian Curriculum F–10 Version 2.0
Pi Leo practice scope
Describe sample distributions and interpret how primary, secondary, random and non-random data were obtained.
Read the official VCAA curriculum description (VC2M8ST02)
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- 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.
- VC2M8ST02-C01Calculate and interpret a sample distribution’s centre.
- VC2M8ST02-C02Analyse and report data with attention to source and selection.
- VC2M8ST02-C03Analyse primary and secondary distributions and report the effect of their sampling methods.
- VC2M8ST02-C04Calculate spread and use it when comparing distributions.
- VC2M8ST02-C05Compare displayed distributions in context, including centre, spread and outliers.
- VC2M8ST02-C06Apply and explain analyse data and its source using calculate and explain each step.
- VC2M8ST02-C07Apply and explain analyse data and its source using compare evidence and check a claim.
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Subskills
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Descriptor-derived subskills
- D01A summary belongs to its sampleCalculate and interpret a sample distribution’s centre.
- D02Where did these data come from?Analyse and report data with attention to source and selection.
- D03Look beyond the averageCalculate spread and use it when comparing distributions.
- D04Calculate and explain each stepApply and explain analyse data and its source using calculate and explain each step.
- D05Compare evidence and check a claimApply and explain analyse data and its source using compare evidence and check a claim.