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An engineer working f or a leading electronics irmclaims to have invented a process for making longer-lasting LCD TVs. Tests run on 24 LCD TVs made with t he ne w process s how a mea n life o f 1725 hours and a standard deviation of 85 hours. Tests run over the last 3 years on a very large number of LCD TVs made with the old process show a mean life of 1538 hours.
a. Is the engineer correct in her claim? Use 
 0.011 tail in making your decision.
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