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Mathematical Requirements for Research Methods

Frequency tables, bar charts, histograms and scatter diagrams

  • 3 things to know
  • Component 01

Overview

Recall questions on frequency tables and tally charts, when to use bar charts and histograms and how they differ, labelling graphs, and recognising positive, negative and no correlation on scatter diagrams.

What you need to know

Answer each one before you reveal it.

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Key term

Why do the bars of a histogram touch?

Key term

When is a bar chart the appropriate display?

Key term

What is a frequency table?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is a frequency table?

    Model answer

    A table that lists each category or class of scores alongside the number of times it occurred.

  2. 2

    How is a tally chart used during data collection?

    Model answer

    A mark is made against a behavioural category each time it is observed, and the marks are counted at the end to give the frequency for each category.

  3. 3

    When is a bar chart the appropriate display?

    Model answer

    When the data is in separate categories or conditions, such as the mean score for each condition of an experiment.

  4. 4

    Why are the bars of a bar chart drawn with gaps between them?

    Model answer

    The gaps show that the categories are discrete and unrelated, with no continuous scale running between them.

  5. 5

    When is a histogram used instead of a bar chart?

    Model answer

    When the data is continuous and has been grouped into class intervals along a numerical scale.

  6. 6

    Why do the bars of a histogram touch?

    Model answer

    Because the intervals form an unbroken continuous scale, so there are no gaps between one class and the next.

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