如果是跟统计软体有关请重发文章 如果跟论文有关也烦请您重发文章 文章类别是为了帮助大家搜寻资料与解答，造成不便之处请见谅 Tree rings, visible when a tree is cut down, are a useful record of the climate during the life of the tree. Under warm and moist conditions, rings increase in thickness (so there are fewer rings per inch of wood) whereas during cold and dry periods tree growth slows and there are many more rings per inch. For example, the oldest living organisms on this planet are bristlecone pines, Pinus longaeva, which are found in the southwestern part of the United States, and one (appropriately named ‘Methuselah’) has been dated at 4,769 years old based on tree rings. A dendrochronologist (someone who studies tree rings) has noted that for some trees in his study area growth rings are deposited at an overall average rate of 3 rings per millimeter, going back a thousand years. He counted the number of rings per millimeter for specific time periods, and recorded the following: Time period Rings/mm 1400-1499 1.5 1500-1599 1.6 1600-1699 4.8 1700-1799 6.9 1800-1899 3.7 Do these data indicate any significant cooler/drier or warmer/wetter periods in this area? 实在是不知道该用甚麽方法解才好...@@ --

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