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






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






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






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






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






6. 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:






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






8. 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.






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






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






11. Are a data mining technology.






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






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






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






15. An ___________ relates two other objects.






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






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






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






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






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






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






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






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






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






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






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






27. To add a new row to a table - use the _____ command.






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






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






30. 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






31. _________ 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.






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






33. 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)






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






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






36. A synonym for data mining






37. 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) ____________.






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






39. 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.






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






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






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






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






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






46. 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






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






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






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