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






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






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






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






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






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






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






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






10. 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.






11. Are a data mining technology.






12. 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) ____________.






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






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






15. 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






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






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






18. 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:






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






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






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






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






23. A synonym for data mining






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






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






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






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






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






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






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






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






32. 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.






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






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






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






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






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






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






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






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






41. An ___________ relates two other objects.






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






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






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






45. _________ 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.






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






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






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






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






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