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 T 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 ,n, of the t distribution.
- Set the significance level, A. You can choose the value to your needs.
- Set the decimal digit as you require.
- The critical value, tA,n will then be calculated correspondingly.
The figure below shows the relationship between the above parameters.
Example: Calculate the critical value of T distribution with degree of freedom (n) = 20 and significance level (A) = 0.95. it is shown by t20,0.95. the decimal digit is 4. The following figure shows the value of t distribution.
The t20,0.95=1.7247 displays on output box. The concept of this calculation is shown below.