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Nematodes: planned comparison

Contrast of all the nematode groups against the control:

Combined contrast hypotheses:

H0: µ1 = 1/3 (µ2+ µ3 + µ4) vs.

Ha: µ1 > 1/3 (µ2+ µ3 + µ4)  one tailed

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

In Excel: TDIST(3.6,12,1) = tdist(t, df, tails) ≈ 0.002 (p-value).

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

x¯isi

G1: 0 nematode10.652.053

G2: 1,000 nematodes10.4251.486

G3: 5,000 nematodes 5.61.244

G4: 1,0000 nematodes 5.451.771

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