What is the purpose of the change in formula from an independent sample t test to a related sample t test?
Independent-samples t tests compare scores on the same variable but related or Paired-samples t tests compare scores on two different variables but for the same group of cases;
To simplify the calculation process when samples are dependent.
To remove the unwanted correlation introduced by the dependence of subjects between the IV conditions.
To remove the influence of unwanted or outlier cases in each sample.
To weight the contribution of each sample by the number of cases present in that sample.
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