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. Which statement removes the table Salesrep from a DBMS?






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






3. _________ 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.






4. 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)






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






6. 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.






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






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






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






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






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






12. 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






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






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






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






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






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






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






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






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






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






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






23. 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 ________________.






24. 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.






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






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






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






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






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






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






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






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






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






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. A synonym for data mining






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






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






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






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






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






41. ___________________ 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






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






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






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






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






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






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






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






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






50. 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: