Premise:
"A third change that would be made immediately concerns the provisions for parcel mail in Alaska."
Hypothesis: There will be another change shortly.

yes

Premise:
"Then the old man dropped his eyes toward Dave, and there was a brief look of pity in them."
Hypothesis: The old man never bothered to look at Dave.

no

Premise:
"Ninety steps will lead you down to the depths of the Tomb of Amenophis II (35); it is the deepest in the valley."
Hypothesis: The tomb was discovered by accident by an archeologist.
it is not possible to tell