Premise:
"I'm not so sure about that, replied Tuppence thoughtfully."
Hypothesis: Tuppence was sure about that.

no

Premise:
"Then he remembered that there was a good supply in Julius's sitting-room."
Hypothesis: The supply in Julius's sitting room was gone long ago.

it is not possible to tell

Premise:
"The Census Bureau, through its effective use of technology in expanding the electronic availability of census data, demonstrates how federal agencies can leverage performance and customer satisfaction through the better use of technology."
Hypothesis: The Census Bureau shows how federal agencies can leverage performance through the use of technology.
yes