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 analytical-oriented organizational structure is a data warehouse _____________.






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






3. ___________________ 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






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






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






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






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






8. 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






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






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






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






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






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






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






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






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






17. A synonym for data mining






18. 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.






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






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






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






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






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






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






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






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






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






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






29. An ___________ relates two other objects.






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






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






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






33. 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 ________________.






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






35. 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) ____________.






36. _________ 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.






37. 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)






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






39. 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






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






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






42. 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.






43. Are a data mining technology.






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






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






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






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






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






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






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