To Test Whether or Not There Is a Difference Between

Multiple Choice

To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments.You are given the results below. $\begin{array}{lllll}\text { Treatment } &&{\text { Observations }} \\\text { A } & 20 & 30 & 25 & 33 \\\text { B } & 22 & 26 & 20 & 28 \\\mathrm{C} & 40 & 30 & 28 & 22\end{array}$
The null hypothesis for this ANOVA problem is

A) $\mu$ ₁ = $\mu$ ₂.
B) $\mu$ ₁ = $\mu$ ₂ = $\mu$ ₃.
C) $\mu$ ₁ = $\mu$ ₂ = $\mu$ ₃ = $\mu$ ₄.
D) $\mu$ ₁ = $\mu$ ₂ = ... = $\mu$ ₁₂.