\(\style{font-family:Times New Roman;}{\frac{{\overline X}_1-{\overline X}_2-\Delta_0}{S_p^2\sqrt{\frac1{n_1}+\frac1{n_2}}}}\)
follows a:
standard normal distribution if both samples are large.
Student’stdistribution with\(\style{font-family:Times New Roman;}{n-1}\)degrees of freedom.
standard normal distribution with\(\style{font-family:Times New Roman;}{n_1+n_2-2}\)degrees of freedom.
Student’stdistribution with\(\style{font-family:Times New Roman;}{n_1+n_2-2}\)degrees of freedom.
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