An engineer measured the Brinell hardness of 25 pieces of ductile iron that were sub critically annealed. The resulting data were: 170 167 174 179 179 187 179 183 179 156 163 156 187 156 167 156 174 170 183 179 174 179 170 159 187     Test hypothesis that the mean Brinell hardness of all such ductile iron pieces is greater than 170.

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