11. Which type of data collection method involves asking questions to gather information from respondents?
12. What is the process of transforming categorical data into numerical values called?
13. Which of the following is NOT a common step in data preprocessing?
14. In data preprocessing, what is the term for the identification and removal of duplicate or redundant data?
15. Which of the following is a common technique for handling imbalanced data in classification problems?
16. What is the process of converting text data into a numerical format so that it can be used in machine learning algorithms called?
17. Which data collection method involves selecting a sample from a larger population and collecting data from the sample only?
18. In data preprocessing, what is the purpose of data scaling or normalization?
19. What type of data collection method involves manipulating one or more variables to observe their effects on other variables?
20. Which of the following is a common technique for handling outliers in a dataset?
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