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Data Handling, Statistics and Mathematical Skills

Graphical representation: Distribution curves (including normal, positive and negative skewed

  • 3 things to know
  • Component 2

Overview

Recall questions on Distribution curves including normal, positive skewed and negative skewed.

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Answer each one before you reveal it.

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Key term

Describe the pattern on a scatter diagram that indicates a positive correlation.

Key term

Describe the pattern that indicates a negative correlation.

Key term

How would you recognise no correlation on a scatter diagram?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Describe the pattern on a scatter diagram that indicates a positive correlation.

    Model answer

    The points slope upwards from bottom left to top right, showing that as one co-variable increases the other increases too.

  2. 2

    Describe the pattern that indicates a negative correlation.

    Model answer

    The points slope downwards from top left to bottom right, showing that as one co-variable increases the other decreases.

  3. 3

    How would you recognise no correlation on a scatter diagram?

    Model answer

    The points are scattered with no discernible upward or downward trend.

  4. 4

    State three characteristics of a normal distribution.

    Model answer

    It is bell-shaped, it is symmetrical about its centre, and its tails approach but never touch the horizontal axis.

  5. 5

    Where do the mean, median and mode lie in a normal distribution?

    Model answer

    All three fall at the same point, in the centre of the curve at its highest point.

  6. 6

    Describe a positively skewed distribution.

    Model answer

    Most of the scores are bunched at the low end and a long tail stretches out towards the high scores on the right.

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