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






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






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






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






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






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






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






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






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






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






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






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






13. 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) ____________.






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






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






16. 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.






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






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






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






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






21. _________ 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.






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






23. 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 ________________.






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






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






26. 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






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






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






29. An ___________ relates two other objects.






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






31. 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






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






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






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






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






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






37. 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.






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






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






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






41. 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.






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






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






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






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






46. ___________________ is used to relate one set of outcomes (dependent variable) to a set of predictor (independent) variables (e.g. - in time series analysis). Through this analysis we attempt to predictive future events - as the dependent variables b






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






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






49. Are a data mining technology.






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