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 will take away user privileges to the database?






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






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






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






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






6. 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.






7. 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)






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






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






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






11. Are a data mining technology.






12. 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.






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






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






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






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






17. 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:






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






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






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






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






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






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






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






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






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






27. 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.






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






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






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






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






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






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






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






35. A synonym for data mining






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






37. 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






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






39. An ___________ relates two other objects.






40. ___________________ 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






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






42. 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) ____________.






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






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






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






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






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






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






49. 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






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