LEVELS OF MEASUREMENTS

• NOMINAL DATA?

  • categorical
  • each participant does not have own individual score
  • mode
  • no measure of dispersion
• ORDINAL DATA?

  • data can be put in order (scale)
  • intervals not fixed and measurable
  • median
  • range
• INTERVAL DATA?

  • data can be put in order and difference measured between data points
  • intervals are fixed
  • mean
  • standard deviation
• STATS TEST REQUIRED FOR NOMINAL DATA?

  • Chi-squared
  • Sign test
• STATS TEST REQUIRED FOR ORDINAL DATA?

  • Mann-Whitney
  • Wilcoxon
  • Spearman's RHO
• STATS TESTS REQUIRED FOR INTERVAL DATA?

  • Unrelated t-test
  • Related t-test
  • Pearson's r