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Critical Value Calculator
All statistics tools
Find Z and T critical values for hypothesis testing.
Test Parameters
Distribution
z-Distribution
t-Distribution
Test Type (Tails)
Two-Tailed (≠)
Left-Tailed (<)
Right-Tailed (>)
Significance Level (α)
Critical Values
±1.9590
Critical Value (Z)
Significance (α)
0.05
Confidence Level
95.0%
About this calculator
Overview
A critical value is a point on the test distribution that is compared to the test statistic to determine whether to reject the null hypothesis.
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Pro Tips
Common alpha levels are 0.05 and 0.01.
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Fun Facts
"Z-scores are used when the population standard deviation is known or N > 30."
"T-scores are used for small samples (N < 30) with unknown population sigma."
