F Critical Value Calculator


Calculating critical values is crucial in various statistical analyses, especially in hypothesis testing and confidence interval estimations. A critical value is the threshold beyond which a statistical test rejects the null hypothesis. Having an accurate critical value calculator simplifies statistical computations and ensures precise results.

How to Use:

To utilize the critical value calculator effectively, input the significance level (α) and the degrees of freedom (df) in their respective fields. Once the values are entered, click the “Calculate” button to obtain the critical value.


The formula to compute critical values varies depending on the statistical test being performed. For example, in the case of a t-distribution, the critical value can be determined using the t-distribution table or statistical software. The formula generally involves the significance level (α) and the degrees of freedom (df).

Example Solve:

Suppose we want to find the critical value for a t-distribution with 20 degrees of freedom and a significance level of 0.05 (α = 0.05). Plugging these values into the critical value calculator yields the critical value, which in this case is approximately 2.086.


Q: What is a critical value?
A: A critical value is the boundary point that separates the acceptance and rejection regions in a statistical hypothesis test.

Q: How do you determine the degrees of freedom?
A: The degrees of freedom depend on the type of statistical test being conducted and are usually calculated as the total sample size minus the number of parameters estimated.

Q: Can critical values be negative?
A: No, critical values are always positive because they represent thresholds on the distribution.

Q: Is it necessary to use a critical value calculator?
A: While it’s possible to determine critical values manually using tables or formulas, a calculator simplifies the process and reduces the chances of errors.


A critical value calculator is an invaluable tool for statisticians, researchers, and students alike, streamlining the process of determining critical values for various statistical tests. By inputting the significance level and degrees of freedom, users can swiftly obtain accurate critical values, enhancing the efficiency and accuracy of statistical analyses.

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