Statistic Distribution and Methods to Perform Statistical Analysis

We’d go through normal distribution, Bernouli distribution, binomial distribution, Poisson distribution, chi-square distribution, etc.

ANOVA (Analysis of Variance) is primarily associated with the F-test, but its scope extends beyond just the F-test.

ANOVA tests whether the means of three or more groups are equal by comparing:

  • Between-group variability (differences across group means).
  • Within-group variability (differences within each group).

The F-test is the default hypothesis test in ANOVA:
[ F = \frac{\text{Between-group variability}}{\text{Within-group variability}} ]

  • A large ( F )-value implies group means differ significantly.

While the F-test is central to ANOVA, other tools and adjustments are used depending on the context:

  1. Post Hoc Tests:
    • After ANOVA detects significant differences, post hoc tests (e.g., Tukey’s HSD, Bonferroni) identify which specific groups differ.
    • These use t-tests with adjusted significance levels.
  2. Non-Parametric Alternatives:
    • When ANOVA assumptions (normality, equal variances) fail, use:
      • Kruskal-Wallis Test: Rank-based alternative (does not use the F-distribution).
      • Welch’s ANOVA: Adjusts for unequal variances (uses a modified F-test).
  3. Repeated Measures/Mixed ANOVA:

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