Text Analytics DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which evaluation metric is most appropriate for a text classification model when the classes are imbalanced (e.g., 95% negative, 5% positive)?

   • AMean squared error
   • BAccuracy
   • CF1-score
   • DSilhouette score
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A team is building a document retrieval system for a large corpus of research papers. They want to rank documents by relevance to a user's query, giving more weight to terms that are rare across the corpus but frequent in a specific document. Which text representation should they use?

   • ABinary bag-of-words
   • BOne-hot encoding of each document
   • CBag-of-words with raw counts
   • DTF-IDF
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   What is the typical output of a sentiment analysis model?

   • AA numerical vector representing the syntactic structure of the text
   • BA classification label such as positive, negative, or neutral
   • CA set of latent topics discovered in the text
   • DA list of named entities mentioned in the text
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   Which approach to sentiment analysis relies on a predefined list of words with associated sentiment scores?

   • ARule-based approach using part-of-speech tags only
   • BMachine learning approach with labeled training data
   • CDeep learning approach using neural networks
   • DLexicon-based approach
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   Why is it important to validate the findings of a text analytics model with domain experts?

   • ATo confirm that the discovered patterns are meaningful and actionable in the real-world context
   • BTo ensure the model's outputs are statistically significant
   • CTo automatically correct any errors in the text preprocessing pipeline
   • DTo replace the need for quantitative evaluation metrics
   Reveal Solution Discussion Select an answer first