Correlation

• correlation studies

  where the researcher investigates the association between 2 co-variables
• purpose of a correlation

  show the strength and direction of an association between variables
• graph used for a correlation

  scattergram
• positive correlation


  as one co-variable increases so does the other
• negative correlation

  as one co-variable increases, the other decreases
• zero correlation


  no relationship between the co-variables
• difference between correlation study & an experiment

  experiments look for a difference & manipulates the IV to measure the effect on DV but a correlation looks for a relationship & doesn't maniulate the variables
• correlational coeffiecient

  number between +1 and -1 that shows the direction and strength of a relationship