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






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






3. 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






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






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






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






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






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






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






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






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






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






13. 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 ________________.






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






15. 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.






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






17. 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:






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






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






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






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






22. A synonym for data mining






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






24. 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.






25. _________ 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.






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






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






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






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






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






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






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






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






34. 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






35. Are a data mining technology.






36. An ___________ relates two other objects.






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






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






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






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






41. 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) ____________.






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






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






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






45. ___________________ 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






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






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






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






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






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