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






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






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






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






5. _________ 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.






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






7. 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)






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






26. 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:






27. 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.






28. ___________________ 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






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






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






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






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 by which numerical data is converted into graphical images is referred to as:






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






35. An ___________ relates two other objects.






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






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






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






39. 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) ____________.






40. 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






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






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






44. 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.






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






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






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






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






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






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