(Answered) A light bulb manufacturer guarantees that the mean life of

Economics

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 710.3 hours with a standard deviation of 62 hours. At an α=0.05, can you support the company's claim using the test statistic?

Claim is the alternative, reject the null and support claim as test statistic (-1.12) is not in the rejection region defined by the critical value (-1.96)

Claim is the null, fail to reject the null and support claim as test statistic (-1.12) is not in the rejection region defined by the critical value (-1.645)

Claim is the null, reject the null and cannot support claim as test statistic (-1.12) is in the rejection region defined by the critical value (-1.645)

Claim is the alternative, fail to reject the null and cannot support claim as the test statistic (-1.12) is in the rejection region defined by the critical value (-1.96)

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