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. 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.






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






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






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






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






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






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






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






10. 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






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






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






13. 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:






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






15. 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)






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






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






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






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






20. To create the primary key clause for the Customer table on the CustomerNum field - which of the following is the correct statement?






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






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






23. Are a data mining technology.






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






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






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






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






28. 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.






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






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






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






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






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






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. 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 ________________.






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






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






38. A synonym for data mining






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






40. ___________________ 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






41. 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






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






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






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






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






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






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






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






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






50. _________ 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.







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