31. What is the term for the process of reducing the dimensionality of data while retaining its most important features?
32. Which data collection method involves the collection of data at regular intervals over a period of time?
33. What does the acronym "ETL" stand for in the context of data preprocessing and integration?
34. In data preprocessing, what is the process of converting data values into a standard format to remove noise and variations?
35. Which data collection method involves manipulating one or more variables to observe their effects on other variables?
36. What is the purpose of data sampling in data collection?
37. What is the term for data that is collected from a single source at a specific point in time?
38. Which data preprocessing step involves checking for and handling duplicate records in a dataset?
39. What is the primary goal of data preprocessing in the context of machine learning?
40. What is the term for the process of organizing and storing data in a structured format that enables efficient retrieval?
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