A Truck Company Wants On-Time Delivery for 98% of the Parts

Multiple Choice

A truck company wants on-time delivery for 98% of the parts they order from a metal Manufacturing plant. They have been ordering from Hudson Manufacturing but will switch to a New, cheaper manufacturer (Steel-R-Us) unless there is evidence that this new manufacturer Cannot meet the 98% on-time goal. As a test the truck company purchases a random sample of Metal parts from Steel-R-Us, and then determines if these parts were delivered on-time. Which Hypothesis should they test?

A) $\mathrm { H } _ { 0 } : p = 0.98$
$\mathrm { H } _ { \mathrm { A } } : p < 0.98$
B) $\mathrm { H } _ { 0 } : p < 0.98$
$\mathrm { H } _ { \mathrm { A } } : p > 0.98$
C) $\mathrm { H } _ { 0 } : p = 0.98$
$\mathrm { H } _ { \mathrm { A } } : p \neq 0.98$
D) $\mathrm { H } _ { 0 } : p = 0.98$
$\mathrm { H } _ { \mathrm { A } } : p > 0.98$
E) $\mathrm { H } _ { 0 } : p > 0.98$
$\mathrm { H } _ { \mathrm { A } } : p = 0.98$