Tree-ring dates were used extensively in archaeological studies at Burnt Mesa Pueblo. At one site on the mesa, tree-ring dates (for many samples) gave a mean date of ?1 = year 1261 with standard deviation ?1 = 38 years. At a second, removed site, the tree-ring dates gave a mean of ?2 = year 1100 with standard deviation ?2 = 35 years. Assume that both sites had dates that were approximately normally distributed. In the first area, an object was found and dated as x1 = year 1207. In the second area, another object was found and dated as x2 = year 1244. (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.) z1 = -1.42 z2 = ???
Tree-ring dates were used extensively in archaeological studies at Burnt Mesa Pueblo. At one site on the mesa, tree-ring dates (for many samples) gave a mean date of ?1 = year 1261 with standard deviation ?1 = 38 years. At a second, removed site, the tree-ring dates gave a mean of ?2 = year 1100 with standard deviation ?2 = 35 years. Assume that both sites had dates that were approximately
(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.)
z1 = -1.42
z2 = ???
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