Wilcoxon Signed Rank test

• Example Q:

  
• How to calculate Wilcoxon

  • find the difference between each set of scores (can be positive or negative)
  • rank the differences (ignoring signs and any 0s)
  • count the number of positive differences and negative differences
  • add up the ranks of the least frequent sign
  • count total No of differences (ignoring 0s) to find observed value - if observed value is less than significant value, results are significant
• How to rank data example Q:

  
• How to read critical values

  
• To read critical values table for Wilcoxon we need to know:


  -the level of significance

  -the number of differences ignoring 0s
• What a significant statement needs to include


  -compare the observed + critical value

  -indicate if the results are significant or not at the 0.05 level of significance

  -indicate which hypothesis we would accept (and outline this) + which we will reject
• Significant statement example:

  
• What to include in a conclusion

  -indicate if the results aren't/are significant in context, referring to p value

  -make a suggestion

  -make an inference

  -state which hypothesis we will reject/accept
• Example conclusion (for a different source than other example Qs):

  DONT SAY 'As P>5' THIS ISNT CORRECT