Low response rates that result when respondents fail to return a completed mail survey are a major factor leading to response rate bias. These low response rates pose a potential problem because
A. a carefully selected convenience sample becomes a probability sample.
B. segments of the population may be overrepresented or underrepresented in the final sample.
C. only surveys with a 100% response rate can be interpreted.
D. the sample size becomes smaller than the researcher intended.
B. segments of the population may be overrepresented or underrepresented in the final sample.
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The greatest vulnerability to teratogens occurs in the ____ stage.?
a. ?zygotic b. ?embryonic c. ?embryonic d. ?germinal
Research reveals that babies perceive input from different sensory systems in a unified way by detecting
A) amodal sensory properties. B) invariant features of the environment. C) affordances. D) pictorial depth cues.
If you were to conduct a survey of working women asking them why they worked, you should expect that the largest percentage of women would answer:
a. for personal fulfillment b. for intellectual stimulation c. because my family expects me to d. for financial necessity
High-achieving students typically have parents who ________
A) are very involved in elementary school but are less involved in middle and high school B) remain invested in their teenager’s education and keep tabs on academic progress C) are somewhat involved in elementary school but are very involved in middle and high school D) rely on the student to communicate with teachers and give them complete scheduling authority