In Vaillant's original study, subjects who were heavy smokers, alcohol abusers, and overweight at age 50, were more likely to be dead by 75–80, and those who were still alive were likely to be classified as ____

According to the text, if the young-old slow down their activity level, this is usually due mainly:

a. because they have lost much of their vigor b. because they have little to keep them active c. because of society's expectations that they will do so d. to indicate their unique social status

What is the probability of randomly selecting a z-score greater than z = 0.75 from a normal distribution?

a. 0.7734 c. 0.2734 b. 0.2266 d. 0.4532