MATH / INFERENTIAL STATISTICS
Build a symmetric z-based confidence interval around a sample mean. Review the equation, substituted values, result context, and modelling limits in one guided workspace.
Use boundary
Build a symmetric z-based confidence interval around a sample mean. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.
CI = x_bar +/- z* s/sqrt(n)
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What you receive
Use boundary
This z interval assumes the selected critical value and sampling model are appropriate.
Use internally consistent units and retain extra precision when carrying the result into another calculation.
Reviewed reference factors