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






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






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






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






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






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






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






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






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






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






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






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






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






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






15. _________ 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.






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






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






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






19. 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)






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






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






22. 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






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






24. An ___________ relates two other objects.






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






26. 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






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






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






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






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






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






32. 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) ____________.






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






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






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






36. 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.






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






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






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






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






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






42. Are a data mining technology.






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






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






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






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






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






48. 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 ________________.






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






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