Correlations

• What is a correlation used to do?

  A technique used to investigate the relationship between two co-variables
• When talking about correlations why is the word co-variables used instead of IV and DV?

  Because a correlation is only looking for a relationship between variables, rather than a difference (cause and effect)
• How do you make a non directional hypothesis in terms of correlations?

  There will be a relationship between attendance (in %) and academic performance (marks on a KA)
• If a question is referring to a correlation what key word will it have?

  relationship
• How do you make a directional hypothesis in terms of correlations?

  There will be a positive correlation between % attendance and academic performance (marks on KA). As the % attendance increases so do the KA scores
• What graphs are always used in correlations

  Scattergraphs
• What is the name of this correlation?

  Curvilinear

  
• When describing a correlation what must you comment on?

  The direction of the releationship (positive or negative)The strength of the releationship (strong or weak)
• What is a correlation coefficient?

  When the direction and strength of the correlation are represented numerically
• Why is a scatter graph an appropriate graph to use for the data collected?

  The data collected can help to determine whether two variables have a correlation