Inferential Testing

• Inferential Testing


  Data collected from the sample to make inferences about the behaviour of the entire target population
• Unrelated = Independent Groups
• Related = Repeated Measures / Matched Pairs
• Nominal + Unrelated


  Chi-Squared
• Nominal + Related

  Sign Test
• Nominal + Correlation

  Chi-Squared
• Ordinal + Unrelated

  Mann-Whitney
• Ordinal + Related

  Wilcoxon
• Ordinal + Correlation

  Spearmans Rho
• Interval + Unrelated


  Unrelated T-Test
• Interval + Related


  Related T-Test
• Interval + Correlation


  Pearsons R
• Answering a Stats Question:

  • State the test
  • Testing for difference or correlation
  • State design e.g. independent/repeated/matched
  • State variables
  • State data type e.g. ordinal as scale
• Blank Fill Answer for Stat Tests

  Calculated value of (X) is greater/less than critical value of (Y), accepting/rejecting the alternative at P = <0.05 for a one/two-tailed test
• Calculating Sign Test

  • Subtract scores A - B
  • Note down if total scores is + / = / -
  • Work out number of participants (N) with difference in conditions (+/-)
  • Work out the least frequent sign (S) of people
  • Work out the critical value
  • S equal to or less than critical value to be significant