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. 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.






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






3. 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.






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






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






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






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






8. 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 ________________.






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






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






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






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






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






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






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






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






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






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






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






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






21. 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)






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






23. A synonym for data mining






24. An ___________ relates two other objects.






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






26. _________ 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.






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






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






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






30. Are a data mining technology.






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






32. 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:






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






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






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






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






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






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






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






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






41. 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.






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






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






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






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






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






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






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






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






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