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One-way ANOVA Inference for one-way ANOVA - page 29 / 41

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Planned comparison:

H0: µ1 = 1/3 (µ2+ µ3 + µ4) vs.

Ha: µ1 > 1/3 (µ2+ µ3 + µ4) one tailed

Contrast coefficients: (+3  −1  −1  −1)

ANOVA:    H0: all µi are equal vs. Ha: not all µi are equal

ANOVA vs. contrasts in SPSS

not all µi are equal

Nematodes result in significantly shorter seedlings (alpha 1%).

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