Statistical Tests

• 3 levels of measurement


  Ordinal

  Ratio and Interval

  Nominal
• Ordinal Data


   scores are ranked. Data doesn’t tell us about difference between scores, just the order​
• Ratio and Interval 


  scale of equal intervals, ratio has a meaningful value of 0 e.g., 0cm beans that no length exists so is ratio, but 0 Celsius means that heat doesn’t exist so can't be ratio, and so is interval. The data gives more than just the order, it shows the difference between the scores​
• Nominal


   frequency scores, so the number of people in a category. No score per ppant (no info on ppant), just number of ppants in a group​
• ​

  Mann – Whitney​


  COGNITIVE

  Lvl of measurement​ - Ordinal​

  Design​ - Independent​

  Test of diff/association​ Difference​

  Significant​ O equal to or less than​
• Spearman Rho​


  BIOLOGICAL ​

  ​

  Lvl of measurement​ - ​Ordinal/Interval​

  Design​ - ​Correlation

  Test of diff/association​ - ​Association

  Significant​ - O equal to or more than​
• Chi Square​


  LEARNING​

  ​

  ​Lvl of measurement​ - Nominal

  Design​ - Independent

  Test of diff/association​ - Difference

  Significant​ - O equal to or b more than​
• Wilcoxon​


  SOCIAL

  Lvl of measurement​ - Ordinal/interval​

  Design​ - Matched pairs/repeated measures​

  Test of diff/association​ - Difference

  Significant - ​O equal to or less than​