The difference of two means in case of small samples is tested by the formula:
A. $$t = \frac{{\overline {{x_1}} - \overline {{x_2}} }}{S}$$
B. $$t = \frac{{\overline {{x_1}} - \overline {{x_2}} }}{S}\sqrt {\frac{{{n_1} + {n_2}}}{{{n_1} - {n_2}}}} $$
C. $$t = \frac{{\overline {{x_1}} - \overline {{x_2}} }}{S}\sqrt {\frac{{{n_1} - {n_2}}}{{{n_1} + {n_2}}}} $$
D. None of these
Answer: Option C
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