Explanation:
Chain indices compute period-to-period changes (e.g., 2021/2020, 2022/2021) and chain them multiplicatively, allowing flexibility but complicating long-term interpretation due to changing bases.
A researcher wants to study the spending habits of households. She divides the city into blocks and randomly selects a few blocks, then surveys every household within them. This is an example of:
Explanation:
Selecting entire groups (clusters) randomly and surveying all units within is cluster sampling. It differs from stratified sampling where samples are drawn from each stratum.
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