Define degrees of freedom in the context of t-tests.

The t test is used to check if the averages of two groups are statistically different from each other or not. Moreover, the significant difference between the two groups can be analysed using t test. It is used the sample size is small and population variances are unknown and the populations are normally distributed.

The t test is used to check if the averages of two groups are statistically different from each other or not. Moreover, the significant difference between the two groups can be analysed using t test. It is used the sample size is small and population variances are unknown and the populations are normally distributed.