(All Steps) For the claim: "The mean life span of a desktop PC is less than 7 years", we have the following sample data: n = 21, X̄=6.8, s = 2.4 years.
Question: For the claim: "The mean life span of a desktop PC is less than 7 years", we have the following sample data: n = 21, \(\bar{X}=6.8\), s = 2.4 years. The significance level is \(\alpha =0.05\). Test the claim.
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