Archaeology: Tree-Ring Data The Sand Canyon Archaeological Project, edited by W. D. Lipe and published by Crow Canyon Archaeological Center, contains the stem-and-leaf diagram shown in Figure 2-19. The study uses tree rings to accurately determine the year in which a tree was cut. The figure gives the tree-ring-cutting dates for samples of timbers found in the architectural units at Sand Canyon Pueblo. The text referring to the figure says, The threedigit numbers in the left column represent centuries and decades A.D. The numbers to the right represent individual years, with each number derived from an individual sample. Thus, 124 2 2 2 represents three samples dated to A.D. 1242. Use Figure 2-19 and the verbal description to answer the following questions. (a) Which decade contained the most samples? (b) How many samples had a tree-ring-cutting date between 1200 A.D. and 1239 A.D., inclusive? (c) What are the dates of the longest interval during which no tree-cutting samples occurred? What might this indicate about new construction or renovation of the pueblo structures during this period?
Statistics: Intro information Data: What is it o information we collect and organize o facts and figures o numbers and text What is the point of Statistics o To process data so that it is useful o Provide meaningful information in an easily accessible way o Answer questions o Tell a story Help business leaders o Improved insight about operations o Make decisions that are: (prove your opinion is right) Data-driven Fact-based o Not based on speculation o EX: UPS, to increase productivity Benefits of Data and Statistics o Reduce cost o Increase profit
