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. 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.






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






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






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






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






6. 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:






7. _________ 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.






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






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






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






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






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






13. Are a data mining technology.






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






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






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






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






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






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






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






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






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






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






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






25. 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)






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






27. A synonym for data mining






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






29. 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) ____________.






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






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






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






33. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






49. 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 ________________.






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







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