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Please choose one of the following topics as your main topic :

(1) When constructing a confidence interval estimate of the population mean μ, how do you decide between the normal distribution and Student t distribution? Please explain the requirements for each distribution.

(2) Could you share a published article with margin of error information?

(3) Fill in the blanks:

DistributionSample Size n Confidence Leveldegrees of freedom α Critical Value(s)
Normal10095%not applicable      
Student t2195%      

(4) You may or may not know that we just adopted the free online resources for Stat 200 in Spring 2015. How do you like the two textbooks? If you can only choose one of them, which one do you prefer?

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