Hello everyone, i m trying to perform a two side t test with 2 unequal samples(different observations) with special statistics addin (and not analysis toolpack due to the unequal samples) but it doesn t let me proceed due to the level of significance. i need an a=0.05 but as you will see from the screen the specific message keeps popping up for every ''a'' except for 0. can anyone help me please?Thank you in advance.