SD

• the larger the SD...?

  The larger the spread of scores
• what is SD?


  A measure of the spread of scores around the mean
• what is the most powerful measure of dispersion?

  SD
• Why is SD the most powerful measure of dispersion?

  It takes all scores into account

  As a result, its often used by researchers who want to know more about the dispersion of their data
• What does SD tell us?

  How far scores deviate the mesn

  (ie how consistent the data is)
• What does a large SD mean?

  A larger spread of data from the mean (more dispersed) so the pps were not affected by the IV in the same way- the data is LESS CONSISTENT and thus less reliable
• What does a small SD mean?

  The data is less spread from the mean (less dispersed) which implies that all pps responded in a FAIRLY SIMILAR WAY the data is more consistent and thus more reliable
• how can SD be shown?

  in a graph
• 2 positives of SD?

  A more sophisticated + sensitive dispersion measure as all scores are used

  Allows for easier interpretation of individual scores
• give one positivie of SD?

  A more sensitive and sophisticated dispersion measure as all scores are used in its calculation
• give another positive of SD?


  Allows for easier interpretation of individual scores
• 2 ccons of SD?

  harder to calculate

  can be hard to interpret
• give one con of SD?

  Harder to calculate
• give another con of SD?

  Harder to interpret if the data is not in a normal distribution curve