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






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






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






4. The SQL built-in functions - which may appear on the same line as the SELECT statement (before the FROM clause) are called _____ functions.






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






6. _________ 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.






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






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






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






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






11. 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:






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






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






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






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






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






17. 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)






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






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






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






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






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






23. 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.






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






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






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






27. 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.






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






29. A synonym for data mining






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






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






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






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






34. 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) ____________.






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






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






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






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






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






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






41. Are a data mining technology.






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






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






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






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






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






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






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






49. ___________________ 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






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