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






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






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






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






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






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






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






8. Which function calculates the number of entries in a table?






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






10. A synonym for data mining






11. 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 ________________.






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






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






14. An ___________ relates two other objects.






15. 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






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






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






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






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






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






21. 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.






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






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






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






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






26. Are a data mining technology.






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






28. 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) ____________.






29. 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.






30. 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.






31. An alternative to the data warehouse concept is a lower-cost - scaled-down version referred to as the _____________.






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






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






34. Which function should be used to calculate the total of all entries in a given column?






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






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






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






38. Increased affordability of ____________ is a reason for the growth in popularity of data mining.






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






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






41. 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






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






43. Gives us an idea of the magnitude of errors. Actual value - estimated value.






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






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






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






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






48. _________ 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.






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






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