1.   A. Growth in household penetration in the U.S. has been very rapid.

2.   After a fitful start, the online travel marketplace is finding firm footing as people become adept at using the Internet and as personal computers achieve greater household penetration.

3.   But the Globe analysis found zero correlation between diversity of staff and change in newspaper sales over the past decade, as measured by household penetration rates.

4.   Cable ratings are generally lower based on household penetration.

5.   Household penetration of computers, pagers and cellular telephones varies by race.

6.   The Post had the greatest household penetration of any large newspaper in the country.

7.   The growth in household Internet penetration is pretty much what analysts expected, says Rick Broadhead, an e-commerce and Internet expert.