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One-way ANOVA Inference for one-way ANOVA - page 40 / 41

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Systat: Power analysis

              Alpha =        0.05

              Model =      Oneway

           Number of groups =            4

                Within cell S.D. =        1.5

                         Mean(01) =        7.0

                         Mean(02) =        8.0

                         Mean(03) =        9.0

                         Mean(04) =       10.0

                        Effect Size =        0.745

   Noncentrality parameter =        2.222 * sample size

                SAMPLE SIZE   POWER

                         (per cell)

                               3          0.373

                               4          0.551

                               5          0.695

                               6          0.802

                               7          0.876

                               8          0.925

If we anticipated a gradual decrease of seedling length for increasing amounts of nematodes in the pots and would consider gradual changes of 1 mm on average to be important enough to be reported in a scientific journal…

…then we would reach a power of 80% or more when using six pots or more for each condition.

(Four pots per condition would only bring a power of 55%.)

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