Confidence Interval for the Estimated Mean of a Population

Given a sample of N values of X randomly drawn from a normally distributed population, this page will calculate the .95 and .99 confidence intervals (CI) for the estimated mean of the population, according to the formula
estimated
population
mean

= sample mean + (se x tcrit)
where:
se =
standard error of the mean; and
tcrit =
the two-tailed critical value of t for the .05 level of significance in the case of a .95 CI; and for the .01 level of significance in the case of a .99 CI

The page will also calculate various summary statistics for the sample.

The logic and computational details of this procedure are described
in Chapters 9 and 10 of Concepts and Applications.



Data Entry:


Please remember to
perform the data-check
procedure.








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