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Year 11 · 2017 syllabus · Module 1 pilot

Graphs that reveal and preserve patterns — Evaluate worksheet

Original practice. Write explanations that distinguish observations, evidence and claims.

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Name: __________________________ Date: ______________

Question 1

A plot is intended to have a linear x-axis, but equal numerical increments are drawn at unequal physical distances. Its y-axis lacks a quantity and unit label, and its error bars are undefined. Critique the plot and describe how to repair it.

Question 2

Write a prediction statement beyond the measured range that clearly states its limitation.

Teacher answer key — 2 questions

Model responses identify the essential ideas. Accept scientifically correct alternatives that address the question; wording need not match exactly.

  1. On the intended linear x-axis, equal numerical increments must occupy equal physical distances; the inconsistent scale distorts the relationship. Unequal point spacing can be correct for unequal x values, and a clearly labelled logarithmic axis uses a different spacing convention. Replot with a consistent linear scale, label the y quantity and unit, and define what the error bars represent.
  2. For example: a model predicts longer time at 10 cm, but 10 cm was not measured and stability may change. Test it before treating the extrapolation as supported evidence.