What single change in the last several decades has had the largest positive effect on the average income of current elderly persons in the United States?
a. More women have worked, and so earn retirement income.
b. Men are living longer, so there are more couples earning the higher male retirement incomes.
c. Individual Retirement Accounts (IRAs) were created.
d. Social Security benefits have significantly increased.
D
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Which of the following statements is TRUE?
a. DZ twins are no more genetically alike than any pair of siblings. b. MZ twins develop from the separate fertilization of two ova. c. DZ twins develop from a single fertilized ovum that divides into two identical cells. d. Members of any set of DZ twins are more similar to each other in terms of their psychological traits than are MZ twins. e. MZ twins generally are more available for research than DZ twins.
A researcher selects a sample of 65-year-olds and interviews and tests them every two years for 14 years. Over these years, some of the subjects die or drop out of the study. This phenomenon is referred to as _______
a. attrition b. terminal drop c. longitudinal loss d. selective bias