Using a 0.05 significance level, test the claim that the means for actual ease of tracheal intubation scores differed between patients in the 4 Mallampati score categories by answering the questions below.

1. What are the omnibus null and alternative hypotheses?

H₀: ₁ = ₂ = ₃ = ₄ = 0, H₁: at least one _i 0

H₀: ₁= ₂ = ₃ = ₄, H₁: at least one _i differs from another _j

H₀: ₁ = ₂ = ₃ = ₄, H₁: _{1 2 3 4}

H₀: ₁ = ₂ = ₃ = ₄, H₁: _{1 2 3 4}

H₀: ₁ = ₂ = ₃ = ₄, H₁: at least one _i differs from another_j

1. What are the independent and dependent variables?

Dependent = Mallampati score, independent = intubation time

Dependent = Mallampati score, independent = ease of tracheal intubation score

Dependent = ease of tracheal intubation score, independent = Mallampati score

Dependent = intubation time, independent = Mallampati score

Variable order does not matter here, i.e., (x,y) is the same as (y,x).