Suppose we take 25 iid observations from normal

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Reference no: EM13640542

Suppose we take 25 i.i.d observations from normal distribution with population standard deviation known to be 30. Further suppose that the sample mean turns out to be 278.

a. what is a 95% CI for population mean?

b. Given the same population standard deviation, how many observations need to be collected to have a halfwidth of 95% CI less than 10?

Reference no: EM13640542

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