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Week 4, computation of the t statistic using the estimated standard error…

- - - - point-biseral correlation
        relationship between two variables, one consisting of regular scores and the second having two values
      - phi-coefficient
        relationship between two variables when both measured for each individual are dichotomous
  - - - positive correlation
        relationship in which two variables tend to change in the same direction
- - - - degree of freedom
        figure in a sample that is independent and can vary
    - - estimation of the standard error S 2/n
    - - estimated Cohen's d
        figure calculated when substituting sample values in place of population values
    - - percentage of variance accounted for by the treatment
        measurement of reduction in variability after removing the treatment effect
      - confidence interval
        range of values centered around a sample statistic
    - - t statistic
        hypothesis testing tool in which estimated standard error is used in the z-score formula denominator