Question 1180477
{{{H[0]: mu = 95000}}}
{{{H[1]: mu < 95000}}}

{{{z = ((X-bar) - mu)/(sigma/sqrt(n)) = (85000 - 95000)/(6500/sqrt(30)) = -8.4265}}}

Since {{{P(Z <= -8.4265) = 0.0000 < 0.05}}}, the conclusion is to accept the alternate hypothesis, or reject the null hypothesis, 
and say that indeed the company's mean salary for mech. engineers is less than that of its competitors.