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






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






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






4. An ___________ relates two other objects.






5. _________ 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.






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






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






8. 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






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






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






11. 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) ____________.






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






13. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






28. 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)






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






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






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






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






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






34. 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.






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






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






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






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






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






40. Are a data mining technology.






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






42. 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 ________________.






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






44. 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






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






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






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






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






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






50. ___________________ 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