Question: Section 3 Consider the light bulb case in Section 2 , but suppose the population standard deviation is not known. Instead, the sample yields a

Section 3 Consider the light bulb case in Section 2 , but suppose the population standard deviation is not known. Instead, the sample yields a sample standard deviation of 50 . Use this case for questions from 30 to 31. To construct a confidence interval of the population average life span in this case, what distribution do you have to use? t-distribution Z-distribution F-distribution Question 31 (5 points) What is the confidence interval of the population average life span of bulbs in this case? Use =0.05. (691.7,708.3) (690.1,709.9) (686.8,713.1)

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