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






2. A synonym for data mining






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






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






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






6. 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) ____________.






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






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






9. 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 ________________.






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






11. 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






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






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






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






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






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






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






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






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






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






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






22. 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.






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






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






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






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






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






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






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






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






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






32. An ___________ relates two other objects.






33. Are a data mining technology.






34. 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)






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






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






37. _________ 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.






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






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






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






41. 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






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






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






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






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






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






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






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






50. 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.