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Do nematodes affect plant growth?

Seedling growth  x¯isi

0 nematode10.8 9.113.5  9.210.652.053

1000 nematodes11.111.1  8.211.310.4251.486

5000 nematodes  5.4  4.6  7.4 5.0 5.61.244

10000 nematodes  5.8  5.3  3.2 7.5 5.451.771

Conditions required:

equal variances: checking that largest si no more than twice smallest si

Largest si = 2.053;  smallest si = 1.244

Independent SRSs

Four groups obviously independent

Distributions “roughly” normal

It is hard to assess normality with only four points per condition. But the pots in each group are identical, and there is no reason to suspect skewed distributions.

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