At about what age will an infant learn to recognize his or her name?

Trevor plans to study the relationship between people's responses to highly stressful situations and their overall health. He decides he must use correlational research, rather than experimental research, to investigate this problem. Trevor most likely chose a correlational method because correlational studies

a. tend to be more accurate than experiments. b. have higher internal validity than experiments when there are two dependent variables. c. can be used to study either positive or negative relationships, whereas experiments can only be used to study positive relationships. d. can be used to investigate factors that would be unethical to manipulate in an experimental study.

Which statement is most accurate regarding the happiness levels of parents?

a. Having children increases happiness in parents. b. Having children makes life richer and more meaningful. c. Having children has resulted in reduced happiness levels in parents throughout history. d. Having children decreases the belief that one will be happier as a parent, but in fact, happiness levels do increase.