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Business Analysis and Decision-Making

Presenting and interpreting data: pie charts, histograms and index numbers

  • 3 things to know
  • A2 Unit 3

Overview

Presenting and reading business data: pie chart angles, histograms and frequency density, and calculating, interpreting and comparing index numbers, with their limitations.

What you need to know

Answer each one before you reveal it.

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Process

How is the angle of a pie chart segment calculated?

Process

How does a histogram differ from a bar chart?

Process

How is frequency density calculated for a histogram with unequal class widths?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    When is a pie chart a suitable way to present business data?

    Model answer

    When showing how a total divides into parts, such as market share or the sources of a firm's revenue, with only a few categories.

  2. 2

    How is the angle of a pie chart segment calculated?

    Model answer

    Multiply the segment's share of the total by 360°, so a product earning 25% of revenue takes 0.25 × 360 = 90°.

  3. 3

    What are the limitations of pie charts?

    Model answer

    They are hard to read with many small segments, show proportions rather than actual values, and make comparisons over time difficult.

  4. 4

    How does a histogram differ from a bar chart?

    Model answer

    A histogram shows continuous data grouped into classes, with no gaps between bars, and the area of each bar, not its height, represents the frequency.

  5. 5

    How is frequency density calculated for a histogram with unequal class widths?

    Model answer

    Frequency density = frequency ÷ class width; for example 40 customers spending £0–£10 gives 4.0 per pound, and 60 spending £10–£30 gives 3.0.

  6. 6

    What is an index number?

    Model answer

    A figure showing how a value has changed relative to a base period, which is given the value 100.

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