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






2. 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.






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






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






5. 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






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






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






8. 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






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






10. 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.






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






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






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 function calculates the number of entries in a table?






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






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






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






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






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






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






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






22. 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)






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






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






25. ___________________ 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






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






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






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






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






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






31. 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) ____________.






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






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






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






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






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






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






38. 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:






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






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






41. 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.






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






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






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






45. An ___________ relates two other objects.






46. _________ 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.






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






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






49. Are a data mining technology.






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