If the data are a population, you do not use confidence intervals. The mean is the true population mean. Confidence intervals are only used for sample means.
This has been confusing me for a while. I understand the difference between using data as population or sample but how would the equation for calculating the confidence interval for mean from the data be different and why?
I did google confidence interval but the confidence interval equation as:
is for calculation when I consider data as a sample.Code:mean - zscore * standard error and mean + zscore * standard error
What if I consider data is a population? If the equation is different for population then why so? Also, what if I want to consider t-distribution instead of normal, how would the equations and probability be different.
I know it's a lot of question but it has confused me really bad.
Thanks
If the data are a population, you do not use confidence intervals. The mean is the true population mean. Confidence intervals are only used for sample means.
sak (05-17-2013)
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