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






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






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






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






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






6. A synonym for data mining






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






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






9. An ___________ relates two other objects.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






26. _________ 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.






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






28. 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






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






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






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






32. 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.






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






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






35. 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.






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






37. Are a data mining technology.






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






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






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






41. ___________________ 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






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






43. 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 ________________.






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






45. 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) ____________.






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






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






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






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






50. 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)