Formula t = (Σ ▒ D) / √ (((〖〗 NΣD ^ 2 - (Σ ▒ D) ^ 2. )) / (N-1)). , where t represents the T - Test. N represent the number of students in the experimental group.
The formula t = (∑ ▒ D) / √ (((〖 N Σ D 〗 2 - (∑ ▒ D) 2)) / (N-1)) when t instead of the T - Test N instead of the number of students in the experimental group