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






2. ___________________ 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






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






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






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






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






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






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






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






10. 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






11. 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)






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






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






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






15. An ___________ relates two other objects.






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






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






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






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






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






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






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






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






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






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






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






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






28. 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) ____________.






29. 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






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






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






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






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






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






35. 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 ________________.






36. _________ 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.






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






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






39. 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:






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






41. 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.






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






43. 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.






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






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






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






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






48. Are a data mining technology.






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






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