Refer to Exercise 8.34. In polycrystalline aluminum, the number of grain nucleation
Chapter 8, Problem 8.35(choose chapter or problem)
Refer to Exercise 8.34. In polycrystalline aluminum, the number of grain nucleation sites per unit volume is modeled as having a Poisson distribution with mean . Fifty unit-volume test specimens subjected to annealing under regime A produced an average of 20 sites per unit volume. Fifty independently selected unit-volume test specimens subjected to annealing regime B produced an average of 23 sites per unit volume. a Estimate the mean number A of nucleation sites for regime A and place a 2-standard-error bound on the error of estimation. b Estimate the difference in the mean numbers of nucleation sites A B for regimes A and B. Place a 2-standard-error bound on the error of estimation. Would you say that regime B tends to produce a larger mean number of nucleation sites? Why?
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