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 clause would be used to create groups of records?






2. ___________________ 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






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






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






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






6. 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.






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






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






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






10. 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.






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






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






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






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






15. A synonym for data mining






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






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






18. 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) ____________.






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






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






21. 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






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






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






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






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






26. 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.






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






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






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






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






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






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






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






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






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






36. 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 ________________.






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






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






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






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






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






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






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






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






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






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






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






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






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






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