Premise:
"As the proposal to create DHS demonstrates, the terrorist events of last fall have provided an impetus for the government to look at the larger picture of how it provides homeland security and how it can best accomplish associated missions."
Hypothesis: The terrorist events made the government look at the big picture of domestic terrorism.

it is not possible to tell

Premise:
"interactive presentations by security staff to various user groups to market"
Hypothesis: Bland presentations with random content to a limited audience.

no

Premise:
"If his theory were true, Edmund Hillary's ascent of Mount Everest would have been motivated by a desire to test new oxygen tanks, and Joshua Slocum would have circumnavigated the world in order rack up frequent-sailing miles."
Hypothesis: This theory claims that Edmund wanted to test new oxygen tanks.
it is not possible to tell