In a study of the development of social skills, a group of children were tested every other year for 6 years. This was a _______ study
a. cross-sectional study c. longitudinal study
b. horizontal study d. case study
C
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The special treatment given to the subjects in the experimental group is called the:
a. hypothesis c. dependent variable b. independent variable d. control variable
The percentage of infertility problems that can be traced back to the male is which of the following?
20% 30% 40% 50%
In associative play, ________
A) a child plays alone or watches other children while they play B) a child plays near other children with similar materials but does not try to influence their behavior C) children engage in separate activities but exchange toys and comment on one another’s behavior D) children orient toward a common goal, such as acting out a make-believe theme
Non-identical twins are called
a) monozygotic twins b) environmental twins c) fraternal twins d) nurture twins