Tests of Correlation- Spearman's and Pearson's

• What is Spearman’s Rho used for?

  Test of correlation between two sets of values
• When is Spearman’s Rho selected for use?

  When one or both variables are ordinal level
• What is the level of measurement for the attractiveness ratings?

  Ordinal, based on subjective ratings
• What hypothesis does the study aim to investigate?

  The matching hypothesis by Walster et al.
• What is the procedure of the study investigating the matching hypothesis?

  • 12 couples selected, photos taken
  • 24 photos randomized and shown to 20 participants
  • Participants rate photos on a scale of 1 to 20
  • Median attractiveness ratings calculated for correlation
• What is the alternative hypothesis in this study?

  There is a positive correlation between ratings
• What is the null hypothesis in this study?

  There is no correlation between ratings
• What is Pearson’s r used for?

  Test of correlation between two sets of values
• When is Pearson’s r selected for use?

  When the data is interval level
• What are the aims and hypotheses of the study?

  • Aim: Investigate the matching hypothesis
  • Alternative hypothesis: Positive correlation in ratings
  • Null hypothesis: No correlation in ratings
• What are the steps involved in calculating correlation values?

  1. Collect data from participants
  2. Calculate median attractiveness ratings
  3. Determine calculated and critical values