Suppose the manufacturer claims that the mean lifetime of a
light bulb is more than 10,000 hours. In a sample of 30 light
bulbs, it was found that they only last 9,900 hours on average.
Assume the population standard deviation is 120 hours. At 0.05
significance level, can we reject the claim by the
Select one: a. We reject the claim b. We accept the claim
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