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Mathematical Requirements for Psychology (Appendix A: AS Unit 2 and A2 Unit 4)

Graphs: plotting and labelling a graph, gradients and intercepts

  • 3 things to know
  • AS Unit 2 and A2 Unit 4

Overview

Recall questions on plotting a graph, labelling a graph, gradients and intercepts.

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Answer each one before you reveal it.

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Key term

A researcher has the mean score for each of three experimental conditions. Which form of display is appropriate, and why?

Key term

Which display is used for two continuous variables measured on the same participants in a correlational investigation?

Key term

On a scatter diagram, which variable belongs on which axis?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    A researcher has the mean score for each of three experimental conditions. Which form of display is appropriate, and why?

    Model answer

    A bar chart is appropriate, because the conditions are separate discrete categories, so the bars are drawn the same width and separated by gaps.

  2. 2

    Which display is used for two continuous variables measured on the same participants in a correlational investigation?

    Model answer

    A scatter diagram is used, with one point marking each participant's pair of scores.

  3. 3

    On a scatter diagram, which variable belongs on which axis?

    Model answer

    Either variable may go on either axis, because a correlation has two co-variables rather than an independent and a dependent variable.

  4. 4

    On a bar chart summarising an experiment, what is shown on each axis?

    Model answer

    The conditions of the independent variable are shown along the horizontal axis and the measured values of the dependent variable up the vertical axis.

  5. 5

    A vertical axis is marked with gridlines every 5 units. A bar reaches exactly midway between the lines labelled 20 and 25. What value does it show?

    Model answer

    The bar shows a value of 22.5.

  6. 6

    A line of best fit passes through the points (2 h, 8.5 h) and (6 h, 6.5 h) on a graph of screen time against sleep. What is the gradient, and what does it mean?

    Model answer

    The gradient is (6.5 − 8.5) ÷ (6 − 2) = −0.5, meaning sleep falls by about half an hour for every extra hour of screen time, a negative relationship.

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Mathematical Requirements for Psychology (Appendix A: AS Unit 2 and A2 Unit 4)

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