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






2. 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.






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






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






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






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






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






8. 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






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






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






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






12. 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 ________________.






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






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






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






16. 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:






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






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






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






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






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






22. 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.






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






24. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






42. A synonym for data mining






43. 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.






44. An ___________ relates two other objects.






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






46. _________ 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.






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






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






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






50. 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)