Question: 19. An engineer working for a leading electronics fi rm claims to have invented a process for making longer-lasting LCD TVs. Tests run on 24

19. An engineer working for a leading electronics fi rm claims to have invented a process for making longer-lasting LCD TVs. Tests run on 24 LCD TVs made with the new process show a mean life of 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.

b. If the engineer is correct, what is the size of the effect? I/O

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