An average light bulb manufactured by acme corporation lasts 300 days with a sta

Question

An average light bulb manufactured by acme corporation lasts 300 days with a standard deviation of 50 days (the distribution is normally distributed). My new friend has started to manufacture more energy efficient light bulbs, but he is not sure he has a good bulb. He gave me 27 bulbs, and thinks that his bulbs last 310 days. What would power be if I tested his 27 bulbs, using two-tailed, alpha = .05 test?
Question 20 1 pts What is 50? population mean, mu sample mean, M population standard devation sample standard devation standard error of the mean sample size D none of the above

Explanation / Answer

Correct option : Population standard deviation

Reason : We are given that an average light bulb manufactured by acme corporation lasts 300 days with a standard deviation of 50 days which says that we are talking about population values.

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