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8.44 More on systematic sampling. Foresters were inter- ested in studying a remote sensing measure of stand- ing timber as an alternative to taking measurements on the ground. The study area was a 1200-acre pine for- est in Louisiana on which the U.S. Forest Service first created a grid of 1410 equally spaced circular plots of 0.05 acre in size over a map of the forest. The ground survey then visited every 10th plot and took measure- ments of tree volume. 34 (a) Assuming the plots are numbered from 1 to 1410, use the information in the previous exercise to explain how you will select a systematic sample of every 10th plot. (b) Now choose a systematic random sample of 141 plots for the ground survey. If you use Table B, start at line 131