I am calculating a t-statistics using known means, standard deviations and degrees of freedom. Because I am not dealing with the actual population data arrays, I cannot use the TTEST function. So, I am just do the underlying math of the t-test calc plugging in my means, sdevs, dfs and I come up with a nice t-statistic. However. I then need to have a t-stat critical value lookup table in order to compare my calced stat to the critical value at the appropriate dfs. Is there anyway, perhaps using TDIST, that I can eliminate the need for a critical value lookup table?