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. ___________________ 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






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






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






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






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






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






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






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






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






10. An ___________ relates two other objects.






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






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






13. 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)






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






15. 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:






16. 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






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






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






19. 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






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






21. Are a data mining technology.






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






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






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






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






26. 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) ____________.






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






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






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






30. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






49. A synonym for data mining






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