Answer:
vote
Explanation:
I know that is one of them
Answer:2. Snowball sampling
Explanation: Snowball sampling refers to a research in which once participants behave been recruited for a study they can also recruit other participants that they know. This is useful when it is hard for a researcher to find potential participants. The name of this research comes from the fact that when you roll down the ball made from snow it will pick up some other particles along the way and it will keep getting bigger and bigger.
Several factors have contributed to the shrinking size of the American middle class after the early 1970s. One of them includes "the emergence of the low-wage service sector."
Other factors that contributed to the shrinking size of the American middle class during this period include:
Greater demand for higher-skill jobs;
The huge income gap between the high paid executives and employees in the middle ranks;
Fewer opportunities for those with little education.
Global competition and advancement in technology;
Surging education fees, health care, and housing cost;
Hence, in this case, it is concluded that the middle class in the United States is smaller today compared to the time before 1970.
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