Dimensionamento amostral para avaliação de altura e diâmetro de mudas de nogueira-pecã

Abstract

The aim of this research was to determine the sample size (number of plants) necessary to estimate the average plant height, collar diameter and relation plant height/collar diameter of seedlings pecan (Carya illinoinensis) and to verify the variability of the sample size among treatments of overcoming seed dormancy. It was evaluated 12 treatments of overcoming seed dormancy and at 98 days after sowing it was measured the plant height (H) and collar diameter (D) and calculated the relation plant height/collar diameter (HD). Measures of central tendency and variability were calculated, the normality and homogeneity of variances were verified and sample size was calculated. The sample size to evaluate H, D e HD is dependent on treatments of overcoming seed dormancy. Sixty-three plants enough to predict the average of H, D and HD seedlings pecan, with an estimation error equal to 10% of estimated average, with a degree confidence of 95%.