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. 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






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






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






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






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






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






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






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






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






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






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






12. An ___________ relates two other objects.






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






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






15. Are a data mining technology.






16. Generally Semantic Object Modeling (SOM) is consideredmore bottom-up oriented than _____________.






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






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






19. A powerful trend in IT is known as - which maintains that Computer transmission speed doubles every 18 months.






20. 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 ________________.






21. 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) ____________.






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






23. Which clause would be used to create groups of records?






24. A synonym for data mining






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






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






27. The SQL built-in functions - which may appear on the same line as the SELECT statement (before the FROM clause) are called _____ functions.






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






29. 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






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






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






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






33. _________ 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.






34. The term _____ has been generally agreed to represent the broadest category of software technology that enables decision makers to conduct many dimensional analysis of consolidated enterprise data.






35. 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.






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






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






38. The set of activities used to find new - hidden - or unexpected patterns in data is referred to as _____.






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






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






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






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






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






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






45. In general - ______________ are transformed to relations/tables by defining one relation for the object itself and another relation for each multivalued attribute.






46. This is not considered one of the four major categories of processing algorithms and rule approaches.






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






48. 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)






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






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