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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






17. 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) ____________.






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






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






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






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






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






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






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






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






26. 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)






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






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






29. 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.






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






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






32. 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:






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






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






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






36. ___________________ 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






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






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






39. 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.






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






41. A synonym for data mining






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






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






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






45. Are a data mining technology.






46. 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






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






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






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






50. 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 ________________.