At Burnt Mesa Pueblo, archaeological studies have used the method of tree-ring d

Question

At Burnt Mesa Pueblo, archaeological studies have used the method of tree-ring dating in an effort to determine when prehistoric people lived in the pueblo. Wood from several excavations gave a mean of (year) 1250 with a standard deviation of 29 years. The distribution of dates was more or less mound-shaped and symmetrical about the mean. Use the empirical rule to estimate the following.

(a) a range of years centered about the mean in which about 68% of the data (tree-ring dates) will be found
between________ and_________ A.D.

(b) a range of years centered about the mean in which about 95% of the data (tree-ring dates) will be found
between____________ and  A.D._______

(c) a range of years centered about the mean in which almost all the data (tree-ring dates) will be found
between___________ and  A.D.______

Explanation / Answer

a) about 68% of the data will be found between 1221 and 1269 A.D

b) about 95% of the data will be found between 1192 and 1308 A.D

c) almost all the data will be found between 1163 and 1337 A.D

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