MCQ
For testing the significance of difference between the means of two independent samples, the degree of freedom (v) is taken as:
- A$n _1- n _2+2$
- B$n _1- n _2-2$
- C$n_1+n_2-1$
- D$n _1+ n _2-2$
(d) $n_1+n_2-2$
Explanation: $n _1+ n _2-2$
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| $X =x$ | $0$ | $1$ | $2$ | $3$ | $4$ |
| $f(X)$ | $\frac{1}{9}$ | $\frac{2}{9}$ | $\frac{3}{9}$ | $\frac{2}{9}$ | $\frac{1}{9}$ |