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What Is a Population and What Is a Sample? How

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What is a population and what is a sample? How are these concepts important for understanding the study of public opinion in the United States? What is a random sample? Why is randomization important to making useful inferences about public opinion? What are some sources of bias that might corrupt the results of a survey even if researchers are careful to try to reach a random sample of the population they are studying?


Definitions:

Inventory Turnover

A proportion indicating the frequency at which a company's stock is sold and replenished during a given timeframe.

Gross Profit Rate

A financial metric that indicates the percentage of revenue that exceeds the cost of goods sold, reflecting a company's operational efficiency.

Accounts Receivable Turnover

A financial metric indicating how many times a company collects its average accounts receivable balance in a period.

Price-earnings Ratio

A valuation metric used to measure a company's current share price relative to its per-share earnings.

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