1. in an experiment to measure the lifetimes of parts manufactured from a certain aluminum alloy, 73 parts were loaded cyclically until failure. the mean number of kilocycles to failure was 783, and the standard deviation was 120. let μ represent the mean number of kilocycles to failure for parts of this type. a test is made of h0 : μ ≤ 750 versus h1 : μ > 750. a. find the p-value. b. either the mean number of kilocycles to failure is greater than 750, or the sample is in the