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






3. 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) ____________.






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






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






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






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






8. A synonym for data mining






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






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






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






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






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






14. 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.






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






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






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






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






19. An ___________ relates two other objects.






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






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






22. 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:






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






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






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






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






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






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






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






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






31. 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






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






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






34. 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.






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






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






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






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






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






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






41. 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)






42. _________ 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.






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






44. ___________________ 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






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






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






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






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






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






50. 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 ________________.