##### Don't understand how to perform two-sided 95% confidence interval

 Statistics Tutor: None Selected Time limit: 1 Day

I have a problem where we have to form a two-sided 95% confidence interval. Our textbooks is practically useless. Help!

Jun 8th, 2015

in most cases confidence interval is taken as 95% This depends on the parameters and error model

This value  has a significance  because it gives impression of the perecision  of parameter estimate

Jun 8th, 2015

I know what it is. I don't understand a particular problem asking me to form a two-sided confidence interval. I am given the mean age of participants in a study, which is 31.5 years, and standard deviation, which is 10.2. Based on this, I found one standard error to be 1.33. However, I understand, from my book, that a Z score would be next, but I don't know how to find μ.

Jun 8th, 2015

I guess I don't even understand what it's asking. Is it asking for the interval in which the researching is 95% confident the population mean will fall under?

Jun 8th, 2015

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Jun 8th, 2015
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Jun 8th, 2015
Dec 4th, 2016
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