A random sample of 16 lightbulbs of one brand was selected to estimate the mean lifetime that brand of bulbs. The sample mean was 1,025 hours, with a standard deviation of 130 hours. Assuming that the lifetimes are approximately normally distributed, which of the following will give a 95 percent confidence interval to estimate the mean lifetime?
(A) 1,025 ± 1.96 (130/v16)
(B) 1,025 ± 1.96 (v30)
(C) 1,025 ± 2.12 (130/v16)
(D) 1,025 ± 2.13 (130/v16)
(E) 1,025 ± 2.13 (130/v15)
Answer: ...