Tree-ring dates were used extensively in archaeol0 ical studies at Burnt Mesa Pu

Question

Tree-ring dates were used extensively in archaeol0 ical studies at Burnt Mesa Pueblo. At one ste on the mesa, tree-ring dates or many samples gave a mean date of second removed site, the tree ring dates gave a mean of 2 year 1113 with standard deviation 2 42 years. Assume that both sites ad da es at were appro mate and dated as x1 year 1223. In the second area, another object was found and dated as x2 - year 1248 year i 60 with Standard deviation 3 years ta no ma distribute 1 the starea an ob e was n The Standard Normal Distribution 0 68% of area 95% or area 99.7% of area (a) Convert both x1 and x2 to z values, and locate both of these values under the standard normal curve of the figure above. (Round your answers to two decimal places.) (b) Which of these two items is the more unusual as an archaeol ogical find in its location? x1 the further a z value is from zero, the more unusual it is. Xii x2i the further a z value is from zero, the more unusual It is. x1i the closer a z value is to zero, the more unusual it is. x2i the closer a z value is to zero, the more unusual it is.

Explanation / Answer

z is calculated (x-mean)/s

z1= (1223-1260)/31= -1.19

z2= (1248-1113)/42=3.2143

x2 is more unsual because it is >3

thus option B is correct

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