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. 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)






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






3. Are a data mining technology.






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






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






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






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






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






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






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






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






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






13. 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






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






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






16. 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.






17. 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.






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






19. 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 ________________.






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






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






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






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






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






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






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






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






28. 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) ____________.






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






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






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






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






33. A synonym for data mining






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






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






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






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






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






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






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






41. 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:






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






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






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






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






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






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






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






49. 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.






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