A researcher post flyers around the community to recruit families for his research. He desires a
sample size of 100 and after 2 days, has already recruited 50 African -American families.
Because 50% of the community population is African-American, he decides to discontinue
recruitment for this group, but continue recruiting participants of other ethnic groups. This
sampling method is known as __________ sampling.
Fill in the blanks with correct word
quota
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Starting in the 1940s, why did pediatricians recommend bottle-feeding over breastfeeding?
A. Bottle-feeding formula contained more nutrients. B. Parents could keep track of the amount of milk the baby was receiving. C. Bottle-feeding offered significant emotional advantages to the mother. D. Bottle-fed babies were more responsive to their mothers.
Define and provide examples of descriptive, relational, and causal studies
What will be an ideal response?
If we want to make comparisons between two groups that we know are different at the start of the experiment, the design to use is:
a. nonequivalent before-after. b. multiple time-series. c. ex post facto. d. interrupted time-series.
A subset of cases selected from a larger population is a __________
a. control group b. target group c. treatment group d. sample