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☐ A
☐ E
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours. A homeowner selects 29
bulbs and finds the mean lifetime to be 988 hours with a standard deviation of 30 hours. Calculate the value of
the test statistic to test the manufacturer's claim at the significance level of 0.05. Asssume that the population
has a normal distribution.
A. -2.15
B. 1.96
C. 3.21
D. -1.32
E. None of the other choices is correct
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