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An engineer measured the Brinell hardness of 25 pieces of ductile iron that were annealed. The...

An engineer measured the Brinell hardness of 25 pieces of ductile iron that were 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

The engineer hypothesized that the mean Brinell hardness of all such ductile iron pieces is greater than 170. Do the hypothesis testing for the engineer.

Math   Statistics-And-Probability   
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