Welcome to the critical value calculator by **ONLINE**! Here you can quickly determine the critical values for most common distributions in statistical testing. In the following, we are focusing on **F distribution**.

Hypothesis test is a method of statistical inference used to decide whether the data at hand sufficiently support a particular hypothesis, namely null hypothesis. **Critical values** allow you to decide whether to **reject** or **non-reject** the null hypothesis. Critical values divide the scale of your test statistic into the rejection region and non-rejection region.

Here are the steps you need to follow:

- Specify the
**degrees of freedom ,d**of the F distribution._{1}and d_{2}, - Set the
**significance level,**. You can choose the value to the set {0.95,0.975,0.99}.*p* - Set the decimal digit as you require.
- The
**critical value, F**_{d}_{1}_{,d}_{2,}will then be calculated correspondingly._{p}

The figure below shows the relationship between the above parameters.

**Example:** Calculate the critical value of F distribution with d_{1}=10 and d_{2}=5 and significance level (p) = 0.95. It is shown by F_{10,5.0.95}. The decimal digit is 4. The following figure shows the value of F distribution.

The F_{10,5,0.95}=3.3258 displays on output box. The concept of this calculation is shown below.