Benjamin/Cummings, 1999 - Science - 620 pages
This coherent text translates the methods of statisticians into "ecological English" so that students may readily apply these methods to the real world. Ecological Methodology, Second Edition provides a balance of material on animal and plant populations. It teaches students of ecology how to design the most efficient tests in order to obtain maximum precision with minimal work. The first part of the text focuses on biological and technical issues in statistical methodology. Students learn about advances that have been made in designing better sampling devices, along with the techniques and equipment used for sampling. The second part deals with creating solid statistical design, and presents all methods that are well-known to statisticians in a language and context that students will easily understand.
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e = 0.10 ; 2 e = 0.25 e = 0.50 e = 1.00 10' O 0.10 0.20 0.30 0.40 Ap = p, —p, =
change in proportion of x types between to and t, for p = 0.5 Figure 3.2 Sample
sizes required for a change-in-ratio estimate of population size at several
This is most easily expressed as a percentage (+25%) or as a proportion (+0.25).
Second, you must choose the probability (a) of the confidence interval not
including the true variance. Then, if sample sizes are not too small (n > 30), from
8.2.4 Proportions and Percentages Stratified random sampling can also be
applied to the estimation of a proportion like the sex ratio of a population. Again
the rule-of-thumb is to construct strata that are relatively homogeneous, if you are