User talk:Nospam123

Hi, could you please check the formula :$$t = \frac{Z} {s} = {\left(\bar{X} - \mu\right)\left/ \left(\frac{\sigma}{\sqrt{n}}\right)\right.}$$ where $\overline{X}$ is the sample mean from a sample

in the page https://en.m.wikipedia.org/wiki/Student's_t-test

I think it misses dividing by s (sample standard deviation divided by the population deviation) or the sigma should be replaced by S, which would be the sample standard deviation.