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Example 10.4 A new process for drawing wire might lead researchers to believe that, on the aver- age, the tensile strength can be improved by 10 psi over the tensile strength using the standard process. In this context, samples of wire from the new process are tested, and their menn tensile strength is compared to the known mean using the standard process, Mo. Here the null hypothesis is Ho: H = My and the alternative hypothesis is = 1 + 10, which is the alternative proposed by the researcher, Examplo 10.9 A vice-president for a large corporation claims that the average number of service calls on equipment sold by that corporation is no more than 15 per week. To inves- tigate her claim, service records were checked for n = 36 randomly selected wecks, with the result i = 17 and 12 = 9 for the sample datit. Does the sample evidence contradict the vice-president's claim at the 5% significance level