You are conducting a study to determine if there is a significant difference between average adult weight of males and females (in pounds). Calculate the test-statistic, t with the following sample data.
$\displaystyle {n}_{{1}}={40}$, $\displaystyle \overline{{x}}_{{1}}={165}$, $\displaystyle {s}_{{1}}={6}$
$\displaystyle {n}_{{2}}={30}$, $\displaystyle \overline{{x}}_{{2}}={170}$, $\displaystyle {s}_{{2}}={6}$

Rounded to 2 decimal places.