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






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






3. 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






4. Are a data mining technology.






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






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






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






8. 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.






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






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






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






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






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






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






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






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






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. Which statement removes the table Salesrep from a DBMS?






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






21. A synonym for data mining






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






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






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






25. 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)






26. An ___________ relates two other objects.






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






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






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






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






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






32. 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 ________________.






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






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






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






37. ___________________ 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






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






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






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






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






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






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






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






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






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






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






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






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






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