Statistics question about confidence intervals

Posted on 2014-04-01 06:16:00 in Statistics by JAY

A simple random sample of 150 has a mean of 168, and the a population has known SD of 15...

What are 80%, 90%, 95% and 98% confidence intervals for the population mean?

How large would your sample have to be for a 95% confidence interval to have a margin of error of at most 1?



Could you explain how you got your answer? I'm really confused by this question....

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