Inferential Statistical Test

• What are the three factors to consider when choosing an inferential statistical test?

  The design of the study, the level of data, and whether a difference or correlation is being measured
• What does it mean if a study involves an unrelated design?

  It means the study uses an independent groups design
• What types of data can be collected during a study?

  Ordinal, nominal, or interval data
• What is the difference between measuring a difference and measuring a correlation?

  Measuring a difference compares groups, while measuring a correlation examines relationships between variables
• What statistical tests are used for different types of data?

  • Nominal:
  • Test of difference: Chi-square
  • Test of association: Chi-square
  • Ordinal:
  • Test of difference: Mann-whitney
  • Test of association: Spearman's Rho
  • Interval:
  • Test of difference: Unrelated t-test
  • Test of association: Pearson's R
• Why is it important to remember the table of statistical tests?

  It helps answer exam questions about appropriate statistical tests for research studies
• What is the purpose of statistical tests?

  To determine whether a significant difference or correlation exists
• What are the two values compared in a statistical test?

  The calculated value and the critical value
• How is the critical value determined?

  It is worked out from a table of probability values based on various factors
• What factors influence the calculation of the critical value?

  Whether it is a one or two-tailed test, the P value, and either the N value or degrees of freedom
• What does the Rule of R state about statistical tests with an R in their name?

  The calculated value must be greater than or equal to the critical value for the result to be significant
• What happens if the calculated value meets the Rule of R?

  The null hypothesis can be rejected and the alternative hypothesis is supported
• What is required for statistical tests without an R in their name to be significant?

  The calculated value must be less than or equal to the critical value