11.4 The Randomized Block Design In a randomized block design, the null hypothesis for the blocking effects for an ANOVA with 4 levels of treatment effect is O Ho: H.1 = H.2 = H.3 = H.4. and Ha: at least one of the blocking means is different from the others. O Ho: H1. = H2. = 13. = M4. and Ha: at least one of the blocking means is different from the others. O Ho: H.1 = H.2 = H.3 = M.4. and Ha: M.1 * H.2 * H.3* H.4. O Ho: H1. = M2. = M3. = M4. and Ha: M1. * H2. # M3. # H4