This document discusses various methods for data interpretation and sampling. It describes different ways that numerical data can be presented, such as line charts, bar charts and pie charts. It also defines key terms like sample size, probability sampling, simple random sampling, systematic sampling, stratified sampling, cluster sampling, non-probability sampling, convenience sampling, judgement sampling, quota sampling and snowball sampling. Sampling error is also defined as errors arising from an unrepresentative sample. Tips are provided for comprehension, such as reading questions first, avoiding regressive reading, and focusing on key words.
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