Graphical representation

• What is a distribution curve?

  A linear representation of data that includes a mean, median and modal score to show a spread of data.
• What is normal distribution?

  A type of distribution where the mean, median and mode are equal. This can be referred to as a bell curve.

  
• What are the features of normal distribution

  • Classic bell shaped curve
  • Mean, median an mode are at the exact mid-point
  • Distribution is symmetrical around the mid-point
  • The dispersion of scores/measurements either side of the mid-point is consistent and can be expressed in standard deviation
• What is negatively skewed distribution?

  A type of skewed distribution where the mode is greater than the mean.

  
• What are the features of negatively skewed distribution?

  • Scores are not distributed equally around the mean
  • The measures of central tendency (mean, median and mode) will increase in value
  • The mean is to the left of the peak
  • The graph will 'tail' to the left
• What is positively skewed distribution?


  A type of skewed distribution where the mode is less than the mean.

  
• What are the features of positively skewed distribution?

  • Scores are not distributed equally around the mean
  • The measures of central tendency (mean, median and mode) will decrease in value
  • The mean is to the right of the peak
  • The graph will 'tail' to the right