part 1) Read the excerpts (listed above) from The Process of Social Research, by

part 1) Read the excerpts (listed above) from The Process of Social Research, by Dixon (the section titled as “Principles of Probability Sampling” [p. 140 – p. 148] can be skipped). Read also the textbook (the section titled as “Sampling” p. 118 – p. 125 ), and answer the following questions.
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What is the difference between probability sampling and nonprobability sampling?
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What is the purpose of probability sampling?
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What is a sample?
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What are the two major advantages of probability sampling?
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What is a (target) population? (To answer this question, you can include or exclude the word “target”.)
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What is a sampling frame?
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What is a coverage error? What kind of problem does it cause in sampling?
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What is simple random sampling?
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How does stratified random sampling differ from simple random sampling?
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How does cluster sampling differ from simple random sampling?
Part 2)Read the article and answer the questions listed at the bottom of this page:( the pictures uploaded)
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What was the research question examined by the Iowa study?
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What was the independent variable in the study?
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List (or describe) the attributes associated with the independent variable.
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What was the dependent variable in the study?
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List (or describe) the attributes associated with the dependent variable.
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How many cases did they study?
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What was the unit of analysis?
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List one extraneous variable.
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What answer to the research question did the study find?