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






2. 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:






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






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






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






6. Are a data mining technology.






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






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






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






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






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






12. 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






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






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






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






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






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






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






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






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






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






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






23. 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.






24. An ___________ relates two other objects.






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






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






27. 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 ________________.






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






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






30. 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.






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






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






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






34. 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)






35. _________ 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.






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






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






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






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






40. A synonym for data mining






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






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






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






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






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






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






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






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






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






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