(b) The null hypothesis is that the population means are equal, and the alternative hypothesis is that they are different. Symbolically, $H_0: \mu_1=\mu_2$ and $H_1: \mu_1\neq\mu_2$.
(c) We have $\bar{x}_1=10$, $\bar{x}_2=12$, $s_1=3$, $s_2=4$, $n_1=49$, and
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