According to researchers at Carnegie Mellon University, the average life span of a computer hard drive is 600,000 hours, or 3.1 years (source: science. newsfactor.com). Suppose a particular company claims that the life span of its hard drives is longer, offering as proof a study based on a sample of 64 of its hard drives. If the sample average life span is 3.22 years, is this sufficient sample evidence to support the company’s claim? Use a significance level of 1% and assume that the standard deviation of life spans for the company’s population of hard drives is .4 years. Show the competing hypotheses as: H0: μ < 3.1 Ha: μ > 3.1
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