Question: Table 3E.4 contains 20 observations on cycles to failure of aluminum test coupons subjected to repeated alternating stress of 15,000 psi at 20 cycles per

Table 3E.4 contains 20 observations on cycles to failure of aluminum test coupons subjected to repeated alternating stress of 15,000 psi at 20 cycles per second. Construct a normal probability plot, a lognormal probability plot, and a Weibull probability plot for these data. Based on the plots, which distribution seems to be the best model for the cycles to failure for this material?

TABLE 3E.4 Cycles to Failure of Test Coupons 8078 1891 13912 3407 6168 15504 893 1255 686 1334 9438 6227 2562 2074 6770 7971 17081 9245 19041 21997

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