Turbine disk. Table shows turbine disk data (rounded to 100 hours)
(a) Do the hazard calculations.
(b) Plot the data on lognormal hazard paper.
(c) How does the lognormal fit compare with the normal fit in Figure?
(d) Estimate the median life. Compare it with the estimate from Figure.
(e) Make a Weibull hazard plot and determine whether the failurerate increases or decreases with age.
(f) Compare the normal, lognormal, and Weibull fits with respect to the upper tails; that is, which is most pessimistic and which is most optimistic?
