Presentation of Data

• Draw a scattergram

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• Draw a Bar Chart

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• Draw a histogram

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• Draw a distribution curve.

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• What is a positive skew distribution?

  When most of the distribution is concentrated towards the left of the graph and there is a long tail on the right.
• In a positive skew distribution curve what effect will extreme values have?

  Extreme values will increase the mean
• In a positive skew distribution curve rank these lowest to highest in terms of score:

  • Mode
  • Mean
  • Median

  Mode, median then mean
• In skewed distribution curves what is the Y axis always?

  It is always the frequency
• What is a negative skew distribution?

  When most of the distribution is concentrated towards the right of the graph meaning there is a long tail on the left.
• In a negative skew distribution curve what effect will extreme values have?

  The extreme scores will decrease the mean
• In a negative skew distribution curve rank these lowest to highest in terms of score:

  • Mode
  • Mean
  • Median


  Mean, median then mode