Results

Repeated Measures ANOVA

Within Subjects Effects
Cases Sum of Squares df Mean Square F p
Alcohol 38.633 2 19.316 74.765 < .001
Residuals 9.818 38 0.258    
Note.  Type III Sum of Squares
Between Subjects Effects
Cases Sum of Squares df Mean Square F p
Residuals 7.071 19 0.372    
Note.  Type III Sum of Squares

Descriptives

Descriptives plots

Assumption Checks

Test of Sphericity
  Mauchly's W Approx. Χ² df p-value Greenhouse-Geisser ε Huynh-Feldt ε Lower Bound ε
Alcohol 0.897 1.949 2 .377 0.907 0.997 0.500

Q-Q Plot

Post Hoc Tests

Post Hoc Comparisons - Alcohol
Mean Difference SE df t pholm
None Some -0.523 0.133 19 -3.924 < .001
  Much -1.902 0.168 19 -11.319 < .001
Some Much -1.379 0.177 19 -7.773 < .001
Note.  P-value adjusted for comparing a family of 3 estimates.

Contrast Tables

Helmert Contrast - Alcohol
Comparison Estimate SE df t p
None - Some, Much -1.213 0.123 19 -9.857 < .001
Some - Much -1.379 0.177 19 -7.773 < .001