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

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Systat: Power analysis

                             Alpha =        0.05

                            Power =        0.80

                            Model =      One-way

         Number of groups =            4

                Within cell S.D. =        1.7

                         Mean(01) =        6.0

                         Mean(02) =        6.0

                         Mean(03) =       10.0

                         Mean(04) =       10.0

                        Effect size =        1.176

  Noncentrality parameter =        5.536 * sample size

                SAMPLE SIZE   POWER

                         (per cell)

                               2          0.394

                               3          0.766

                               4          0.931

                Total sample size = 16

If we anticipated that only large amounts of nematodes in the pots would lead to substantially shorter seedling lengths and would consider step changes of 4 mm on average an important effect…

…then we would reach a power of 80% or more when using four pots or more in each group (three pots per condition might be close enough though).

guessed

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