Research based on Bowlby's approach indicates that teens who have _____ their parents are likely to have _____ with peers

Comparing all means from a four-group design would require the calculation

of a. four t tests b. six t tests c. one t test d. fifteen t tests

The discussion of motherhood examines infant mortality rates for several countries. According to these data,

a. the United States and Canada have the lowest infant mortality rates in the world. b. in some countries in Africa, more than 10% of infants die before their first birthday. c. the countries with the lowest infant mortality rates are all located in Europe. d. all the developed countries have almost identical infant mortality rates.