to detection of suitable sampling method to study tree canopy cover in the northern zagros forest, baneeh region forest, kurdistan province, and west of iran was selected. 40 square sample plots one hectare (100×100 m) were selected and perfect inventoried. in every sample plot the position of tree, kind of species and two diameter of crown (m) were recorded. to study of canopy cover different ...

Abstract Determination of sample size (the number replications) is a key step in the design an observational study or randomized experiment. Statistical procedures for this purpose are readily available. Their treatment textbooks often somewhat marginal, however, and frequently focus on just one particular method inference (significance test, confidence interval). Here, we provide unified revie...