The use of Biometrical Methods in the Interpretation of Codling Moth Experiments

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Abstract
In this paper, the use of statistical methods in the analysis of data of codling moth, Carpocapsa pomonella Linn., experiments and the manner of determining the degree, of confidence that can be placed in the results are described. The importance of defining the region to which the results of the field tests apply, of selecting typical orchards, and of measuring the homogeneity of 'the experimental areas is stressed. Ths usual methods of measuring variation are described and illustrated by experimental data, special attention being paid to the calculation of the probable error of a mean and standard deviation when the number of trees in a plat are less than 16. The influence of numbers on the confidence that can be placed in experimental plats is shown and the writer includes certain formulae that may be of use to investigators in entomology.

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