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






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






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






4. 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) ____________.






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






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






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






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






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






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






11. _________ 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.






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






13. A synonym for data mining






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






15. 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:






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






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






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






19. 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)






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






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






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






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






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






25. 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






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






27. An ___________ relates two other objects.






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






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






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






31. 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.






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






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






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






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






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






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






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






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






40. Are a data mining technology.






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






42. ___________________ 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






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






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






45. 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






46. 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.






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






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






49. 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 ________________.






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