Observational studies have shown that _________ are the most prevalent and important friendship structures for adolescents

In an American study (Brim, 1999) involving over 2,000 midlife adults aged 40 to 59, approximately what percentage described their marriage as "excellent" or "very good"?

a. 75% b. 65% c. 55% d. 45%

Of U. S. women age 50 and over, the best estimate is that about 20% will suffer a broken bone related to osteoporosis

Indicate whether the statement is true or false