Author: United States Department Of Agriculture

Publisher: Forgotten Books

Published: 2017-11-14

Total Pages: 398

ISBN-13: 9780331031317

Excerpt from Integrated Pest Management Research Symposium: The Proceedings; August 1985 Sample unit shape, as well as size, is an important factor to consider when sampling I 0 egg galleries (fig. 2, table The 5 x 20 cm samples have ca. Half the standard deviation as cm samples while the lox 10 cm samples fall in between. The cm (25 cm2) sample unit is just as good as the 20 X5 cm (100 cm?) sample unit even though the latter has four times the bark area. The orientation of the 10 cm sample so that it cuts across more of the vertical egg gallery systems reduces the number of zero counts and the standard deviation. Size of the sample unit still has an effect, but only when com pared between samples of similar shape. Regression equations of sample variance versus mean density can be used to calculate the number of samples needed to estimate I 0 population densities at any desired precision and confidence level. The equation for calculating sample size n is. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.