Given the information in the problem, we have:
$s_1 = 1.9$, $n_1 = 50$, $s_2 = 1.4$, and $n_2 = 50$.
Now, we can plug these values into the formula:
$$SE(x_1 - x_2) = \sqrt{\frac{1.9^2}{50} + \frac{1.4^2}{50}}$$
Calculating the values inside the square root:
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