When usinga cross-sectional design, researchers ________
A) need to be concerned about such difficulties as participant dropout
B) benefit from its greater efficiency compared to the longitudinal approach.
C) study groups of participants of the same age in different years
D) measure participants at regular intervals over a short amount of time
Answer: B
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Postpartum depression
a. occurs in 50% to 80% of women several days after delivery. b. is extremely different from other kinds of depression. c. usually occurs toward the end of pregnancy. d. may last for many months.
Research studies have shown that infants can imitate adults opening their mouths and sticking out their tongues. How early has this imitative behavior been observed in infants?
a. At 2 days of age b. Less than 1 hour old c. Not before 3 days of age d. After 1 week
The typical use effectiveness rate for combination birth control pills is ____
a. 88% c. 95% b. 92% d. 99.7%
An evolutionary psychologist studying the evolution of the human hand examines and tries to understand the structure of the hand and then assesses it side-by-side with the hands of other species (e.g., chimps). What two approaches, in order,
is this psychologist using? a) comparative; functional b) functional; comparative c) relational; structural d) structural; relational