The school newspaper reports that the GPA of athletes is slightly higher than the GPA of undergraduates in general. Suppose you want to use these data to argue that athletes are smarter than the average student. Someone else points out that intelligence (smartness) is only one of several factors influencing GPA; others are self-discipline, tutoring, pressure from coaches, required class attendance, and so on. Each of these latter factors is a potential ____ in any simple explanation of GPA.
a. exogenous variable
b. moderator variable
c. placebo
d. confounding variable
e. discriminant variable
Question 2
A researcher who wants to conduct a study in the local high school finds that she must use volunteers rather than intact class groups. In this case, the researcher should
a. make sure to use a sample of at least 30 or more subjects.
b. control for the subjects' willingness to volunteer.
c. keep the volunteer subjects naive as to the purpose of the study.
d. determine the extent to which volunteers may differ from nonvolunteers on important variables.
This young boy with muscular dystrophy needs to receive tube feedings and home nursing care. He atte
In 1879 an army officer founded the Carlisle School in Pennsylvania to “civilize” young Indians. The
The risk of dying before the age of 65 gets lower as family income gets higher.
School age (late childhood): 6–12 years, or to puberty.
A steady needle reading that rises 2 or 3 inches Hg when the engine speed is increased slightly ...
Tickets for the school play were $3 for students and $5 for all others. The box office sold 750 ...