StatisticsHypothesis Testing

One-Sample Z-Test

Test a population mean μ when the population standard deviation σ is known. Get the z-statistic, p-value, critical value, and a full step-by-step decision.

Live Calculator · Step-by-Step · Statistics
Inputs
Results
Z-Statistic
P-Value
Critical Value z*
Standard Error
Decision
Step-by-Step
Normal Distribution — Z-Test Visualization

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