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Grade 8 · Science · Unit 10 of 13

Evidence, Bias & Models

How scientists test, check and model ideas

What your child practises

Children practise how scientists collect evidence, reduce bias, use peer review and rely on models that can be well established or still tentative.

Manitoba Curriculum learning outcome: SCI.8.D.1, SCI.8.D.3, SCI.8.D.4 · systematic data, peer review, bias, and well-established and tentative models

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Bias in an experiment is…

    • a measurement tool
    • a lab coat
    • a unit of volume
    • something that unfairly pushes results in one direction

  2. Question 2

    Why is a conclusion reviewed after an experiment?

    • to change the data
    • to hide the method
    • to make it shorter
    • to detect errors and check it matches the data

  3. Question 3

    Which is a mathematical model?

    • a sculpture
    • an equation that predicts how far a ball will travel
    • a toy car
    • a diagram on a wall

  4. Question 4

    Which is an example of bias in sampling?

    • surveying only students on the basketball team about favourite sports
    • surveying a random mix of students
    • using a large sample
    • measuring with a calibrated tool

  5. Question 5

    The Solar System model is…

    • tentative and unsupported
    • a made-up story
    • unchanged for all time
    • well established, supported by lots of evidence

  6. Question 6

    Which statement best describes how science handles an error found in a published study?

    • the study is always right
    • the error is hidden
    • the error is reported and the conclusions are corrected
    • science stops

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