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






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






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






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






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






6. 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






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






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






9. ___________________ 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






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






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






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






13. A synonym for data mining






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






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






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






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






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






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






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






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






22. Are a data mining technology.






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






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






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






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






27. 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






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






29. 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)






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






31. 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 ________________.






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






33. _________ 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.






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






35. 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.






36. 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.






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






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






39. 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) ____________.






40. 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.






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






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






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






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






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






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






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






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






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






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







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