The correlation between the IQs of biological parents and their offspring reared

The overall rate of STDs is higher among women than men because

A) while men have more sexual partners than women, women are less likely to use adequate protection. B) women tend to receive less information about safe sexual practices. C) it is at least twice as easy for a man to infect a woman with any STD than for a woman to infect a man. D) rates of promiscuity in the last decade have risen sharply in U.S. women.

Recall that a nursing home director in Connecticut cooperated with researchers Langer and Rodin (1976)

To some residents he gave a speech that included such statements as "You have the responsibility of caring for yourselves, of deciding whether or not you want to make this a home...." and "You should be deciding how you want your rooms to be arranged...how you want to spend your time...." To others he said that there would be movie nights and plants for them that the nurses would care for. The researchers then kept track of health problems and deaths of all the residents. What was the independent variable of this research? a. the health of the residents b. the control they were given c. the nurses who took care of the plants d. the movies that residents attended