1. A botanical researcher wishes to design a survey to estimate the number ofbirch trees in a study area. The study area has been divided into 1000 units orplots. From previous experience, the variance in the number of stems per plotis known to be approximately σ^2 ≈ 45. Using simple random sampling, whatsample size should be used to estimate the total number of trees in the studyarea to within 500 trees of the true value with 95% confidence? To within 1000trees? To within 2000 trees?2. Compute

An investigator is interested in estimating the total number of "count trees" (trees larger than a specified size) on a plantation of N=1500 acres. This information is used to determine the total volume of lumber for trees on the plantation. A simple random sample of n=100 one-acre plots was selected, and each plot was examined for the number of count trees. The sample average for the n=100 one-acre plots was y̅=25.2 with a sample variance of s^2=136. Estimate the total number of count trees on

How Much Do Trees Weigh? - Theyardable