Find here the type I error probability formula to calculate the t-value. The type 1 error is wrong rejection of a true null hypothesis (false positive). Whereas type 2 error is wrong retainment of false null hypothesis (false negative). Type 1 Error formula is defined as t-value = signal / noise. This calculates the mean, standard deviation, count, signal, sp, noise, T value and the P-Value. It occurs when detecting an effect that is not present where it has happened in the past.