Barlow, Toland, and Freeman (1984) studied the lifetimes of Kevlar 49/epoxy strands subjected to sustained stress. (The space shuttle uses Kevlar/epoxy spherical vessels in an environment of sustained pressure.) The files kevlar70, kevlar80, and kevlar90 contain the times to failure (in hours) of strands tested at 70%, 80%, and 90% stress levels. What do these data indicate about the nature of the distribution of lifetimes and the effect of increasing stress?
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