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CO 5) A light bulb manufacturer guarantees that the mean life

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CO 5) A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 720

hours. A random sample of 51 light bulbs as a mean of 705.4 hours with a population standard deviation of 62 hours. At an α=0.05, can you support the company’s claim using the test statistic?

Ans

a)Claim is the alternative, fail to reject the null and cannot support claim as the test statistic (-1.68) is in the rejection region defined by the critical value (-1.96)

B)Claim is the alternative, fail to reject the null and cannot support claim as the test statistic (-1.68) is in the rejection region defined by the critical value (-1.96)

c)Claim is the alternative, fail to reject the null and cannot support claim as the test statistic (-1.68) is in the rejection region defined by the critical value (-1.96)

D)Claim is the alternative, fail to reject the null and cannot support claim as the test statistic (-1.68) is in the rejection region defined by the critical value (-1.96)

 
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