Test your basic knowledge |

Data Mining

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Increased affordability of ____________ is a reason for the growth in popularity of data mining.






2. The ACCESS feature that tests to see if your tables are normalized properly is the ____.






3. A Star diagram has two types of tables (objects). They are called the___________________ tables and ; fact tables.






4. Which statement removes the table Salesrep from a DBMS?






5. The _____ operation of two tables results in a single table with the same columns as the first table - and containing all rows that are in the first table merged with all the rows in the second table - minus any duplicate rows.






6. You can save the results of a query as a table by including the _____ clause in the query.






7. Organizes and analyzes data as an n-dimensional cube. The cube can be thought of as a common spreadsheet with two extensions: (1) support for multiple dimensions and (2) support for multiple concurrent users.






8. Twice as likely to identify the important class (compared to avg. prevalence)






9. ___________ determines exactly what level of detail constitutes a fact record.






10. The product of two tables is also called the ________ product.






11. The process by which numerical data is converted into graphical images is referred to as:






12. The term "ETL" in data warehousing stands for: Extraction - ________________________ - & Loading.






13. Semantic object link (SOL) attributes establish a relationship between one _______ and another.






14. The process that records how data from operational data stores and external sources are transformed on the way into the warehouse is referred to as ________________.






15. R- squared(and adjusted r-squared) - A measure of how much of the variability around the target mean is explained by your predictive variables. Doesn't mean you have a good predictive model—only validation will tell you that






16. The SQL command for deleting the Warehouse field from the Part table is _____.






17. The deletion of a record that also deletes related records is referred to as a(n) _____.






18. _________ seeks to ensure that each application under development is fully integrated within its own boundaries and to eliminate any inconsistencies in the final software product.






19. To create the primary key clause for the Customer table on the CustomerNum field - which of the following is the correct statement?






20. To add a new row to a table - use the _____ command.






21. An economic feasibility measure. So is Internal rate of return.






22. Are a data mining technology.






23. A compound semantic object is an object that contains at least one ____.






24. Information about tables in the database is kept in the _____.






25. Within most organizations - the person known as the _____ determines the type of access various users can have to the corporate or enterprise database.






26. Which rule would you be violating - if you tried to delete a sales rep record - who currently has customers on file?






27. A common example of the use of association methods where a retailer can mine the data generated by a point-of-sale system - such as the price scanner you are familiar with at the grocery store is referred to as:






28. Which data mining technique utilizes linkage analysis to search operational transactions for patterns with a high probability of repetition?






29. Models that do ___________: MLR; KNN; Regression and Classification Trees; ANN; SVM






30. Gives an idea of systematic over- or under-prediction. Magnitude of average absolute error.






31. Useful for assessing performance in terms of identifying the most important class. Helps such choices as: How many tax records to examine; How many loans to grant; How many customers to mail an offer






32. The _______________________ represents the source data for the DW. This layer is comprised - primarily - of operational transaction processing systems and external secondary databases.






33. On an ER Diagram the number (mark) on relationship line that is farthest away from each entity (rectangle) represents the _______ cardinality.






34. A _____________ is a system-generated primary key.






35. Which of the following database design and data warehouse design approaches is viewed to take a more strategic rather than operational perspective?






36. __________ occurs when the initial scope of a project continues to expand as new features are incorporated into the project.






37. These are considered an alternate storage techniques for data warehousing include.






38. 'Signatures' are used for intrusion detection by _______?






39. An analytical-oriented organizational structure is a data warehouse _____________.






40. ___________ is not a characteristic of a data warehouse.






41. ____________ would not normally be associated with ROUTINE data warehouse maintenance.






42. Why are Star Schemas so useful in Financial Planning and Accounting Information Systems?






43. A single column that you create for an entity to serve as the primary key - because you otherwise would need many concatenated columns to do so - is called a(n) ____________.






44. Not the same as goodness-of-fit; We want to know how well the model predicts new data - not how well it fits the data it was trained with; Key component of most measures is difference between actual y and predicted y (error)






45. Which statement will take away user privileges to the database?






46. A synonym for data mining






47. The minimum cardinality and m is the maximum cardinality Cardinalities in Semantic Objects are shown as subscripts in the format n-m where _____






48. A ___________ combines result sets from more than one fact table.






49. Which of the following is at the center of a star schema?






50. When an entity has a minimum cardinality of one it means the entity is required in _______.