To assess the presidential candidate preferences of the registered voters in Maricopa County, a researcher classifies the voters by social class and age. The researcher randomly selects voters from each subgroup according to its proportion in the entire county. This sampling technique is called _____ sampling.
Fill in the blank(s) with the appropriate word(s).
stratified random
Psychology
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By the end of the fourth week the embryo's head is apparent and the eyes, nose, mouth, and ears begin to form. How long is the embryo at this point?
a. ΒΌ inch b. 4 inches c. 8 inches d. 12 inches
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__________ is a major cause of late-life disability and, after age 75, death
A) Type 2 diabetes B) The flu C) Stroke D) Arthritis
Psychology