Question

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 μ1 = year 1276 with standard deviation σ1 = 32 years. At a second, removed site, the tree-ring dates gave a mean of μ2 = year 1125 with standard deviation σ2 = 44 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 1188. In the second area, another object was found and dated as x2 = year 1227. Convert both x1 and x2 to z values. (Use 2 decimal places.)

z1 =

z2 =

Answer 1

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