Learning Objectives

  • Identify the appropriate sampling distribution to use for a hypothesis test for large samples when you have a two-category independent variable and an interval- or ratio-level dependent variable.
     
  • Explain why you must use a slightly different hypothesis test when you cannot assume the variances for two groups are equal.
     
  • Describe the difference between independent groups and matched groups.
     
  • Conduct a hypothesis for the difference between means using the three variations of the t test, and interpret the results.
     
  • Conduct a hypothesis for the difference between proportions, and interpret the results.