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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. Are a data mining technology.






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






3. 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






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






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






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






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






8. ___________________ 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






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






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






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






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






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






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






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






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






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






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






19. 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.






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






21. _________ 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.






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






23. 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) ____________.






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






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






26. A synonym for data mining






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






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






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






30. 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






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






32. An ___________ relates two other objects.






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






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






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






36. 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:






37. 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.






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






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






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






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






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






43. 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)






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






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






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






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






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






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






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






Can you answer 50 questions in 15 minutes?



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