inferential statistics

• Chi squared test


  Used when the test is a correlation or independent measures and has nominal data. Shows that there is a difference.
• Sign test


  used when the test is repeated measures and has nominal data
• Spearman's rho test


  used when the test is a correlation and uses ordinal data
• Mann-Whitney Test


  used when the it uses independent measures and ordinal data
• Wilcoxon test


  used when it is repeated measures and uses ordinal data
• degrees of freedom

  (number of rows - 1) x (number of columns - 1)
• If the inferential statistic has an R in the name, the observed value must be higher than the critical value to be significant
• If the inferential statistic doe not have an R in the name, the observed value must be lower than the critical value for it to be significant.
• when a test is significant

  we reject the the null hypothesis
• when a test is not significant

  we accept the null hypothesis