Correlation

• correlation


  strength of a r.s. between two sets of data
• Correlation scattergraphs


  positive, negative, strong, no, weak, moderate

  
• Correlation analysis


  the closer the score is to zero, the weaker the correlation

  score is known as a correlation co efficient
• Strength - correlation


  • allows r.s. between two sets of data to be seen
  • can show relationships that might not be expected
• Weakness - correlation


  • unable to show cause and effect
  • cannot use on curvilinear relationships
  • often misreported in the media
• Correlation hypothesis


  directional -

  " There will be a significant ____ positive/negative correlation between ___ and ___"

  non directional -

  "There will be a significant ____ correlation between ___ and ___"

  null -

  "There wil be no significant correlation between ___ and ___"