Premise:
"They let the press could catch glimpses of a man who looked vaguely historical, drumming up that little bit of extra interest."
Hypothesis: They would arrange for him to be seen eating at a posh restaurant, just briefly, to drum up interest.

it is not possible to tell

Premise:
"Having assessed the resource requirements for individual or multiple retrofits of control technologies, this chapter will assess the resource availability in the United States for retrofit of control technologies for the Clear Skies Act."
Hypothesis: The resource requirements for individual or multiple retrofits of control technologies have not been assessed.

no

Premise:
"But despite the odds, I find it worthwhile to try to make the connection."
Hypothesis: I think making a connection is valuable.
yes