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Fig. 5. Scatter plots of mean score (mean of control, DMS andPEA) versus chick mass for (A) blue petrels, (B) thin-billed prions and (C) common diving petrels. The trend line for blue petrels highlights a statistically significant Spearman {rho} correlation. The sample size for thin-billed prions (12) provides too low a statistical power for detecting an association. Power analysis for the Pearson Product Moment (the parametric equivalent of Spearman's {rho} correlation coefficient) indicates that a sample size of 34 is needed for a 90% chance of detecting a ±0.50 correlation coefficient (Cohen, 1988).





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