According to Thomas and Chess, who carried out a large-scale study of infants in the New York Longitudinal Study, what percentage of children were found to be "slow-to-warm babies"?

Brittany is eight years old. Her daily activities include helping her mother make meals, running the household, and looking after her baby brother. Most likely, Brittany lives in a(n)

a. traditional preindustrial culture. b. urban Westernized area. c. large single-family household. d. industrialized European nation.

Suppose that the world record winning time for the half-marathon was 1 hour 10 minutes in 1900. If the world's fastest 60-year-olds ran a half-marathon race today, what would you expect the winning time would be?

a. 2 hours 20 minutes b. 2 hour 0 minutes c. 1 hour 50 minutes d. 1 hour 10 minutes