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Data cleaning is widely regarded as the most challenging and time-consuming step in data analysis. Analysts often encounter issues such as missing data, inconsistent formats, outliers, and duplicate entries. Addressing these problems requires a meticulous approach to ensure data quality without losing valuable information. For example, cleaning customer survey data may involve filling missing age values using statistical imputation or correcting typos in categorical fields. Data cleaning underpins the reliability of subsequent steps like modeling and interpretation, making it a critical yet complex task. Why Other Options Are Incorrect: • A: While important, data collection is generally less time-consuming with well-defined sources. • C: Modeling complexity depends on the problem; simple models may suffice in many cases. • D: Visualization requires creativity but is less technically challenging than cleaning. • E: Interpretation is crucial but depends on having clean, reliable data.
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