Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

تمرين 42

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 three-digit 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

The Sand Canyon Archaelogical Project
Tree-Ring-Cutting Dates from Architectural Units of Sand Canyon Pueblo: The Sand Canyon Archaeological Project.