Objective 2.1 Gather Data Sets CERTIFIED-DATA-SCIENCE-PRACTITIONER Practice Questions (Page 8)

Questions 36–39

1. 36foundation · easy

   What is a primary use case for AI-generated synthetic data?

   • AAugmenting a small dataset to improve model training.
   • BVisualizing data in a dashboard.
   • CStoring data in a cloud database.
   • DReplacing the need for any real data.
   Reveal Solution Discussion Select an answer first
2. 37expert · hard

   A data engineer needs to query a Cassandra table that stores sensor readings. The table has columns: sensor_id (partition key), timestamp (clustering key), value. They need to retrieve the latest reading for each sensor. Which query is correct?

   • ASELECT sensor_id, timestamp, value FROM sensor_readings PER PARTITION LIMIT 1;
   • BSELECT sensor_id, timestamp, value FROM sensor_readings WHERE sensor_id = ? ORDER BY timestamp DESC LIMIT 1;
   • CUse a separate query for each sensor_id with ORDER BY timestamp DESC LIMIT 1, and combine the results in the application.
   • DSELECT sensor_id, MAX(timestamp), value FROM sensor_readings GROUP BY sensor_id;
   Reveal Solution Discussion Select an answer first
4. 38foundation · easy

   Which type of data source is obtained by purchasing or licensing data from another organization that collected it directly?

   • AThird-party data
   • BOpen-source data
   • CSecond-party data
   • DFirst-party data
   Reveal Solution Discussion Select an answer first
5. 39application · medium

   A data analyst wants to scrape product prices from an e-commerce website to build a price comparison tool. The website's terms of service prohibit automated scraping. What should the analyst do?

   • AUse the website's official API if available, or request permission from the website owner.
   • BProceed with scraping but limit the request rate to avoid overloading the server.
   • CUse a web scraping service that bypasses the terms of service.
   • DScrape the data anyway because it is publicly accessible.
   Reveal Solution Discussion Select an answer first