CHOOSING A STATS TEST

• What questions do you need to ask when choosing a statistical test?

  correlation between two variables or difference between two groups

  If difference did it use independent groups

  What level of measurement is the DV
• Nominal, difference and independent groups

  Chi Squared test X2
• nominal, difference and repeated measures or matched pairs

  Sign test S
• ordinal and correlation

  spearman’s test (r)
• ordinal, difference and independent groups

  mann Whitney test (U)
• ordinal, difference and repeated measures or matched pairs

  Wilcoxon test (T)
• interval, difference and independent groups

  Unrelated t test (t)
• interval and correlation

  Pearsons test (r)

  only used when both co-variables are interval
• interval, difference, repeated measures or matched pairs

  Related t test (t)