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






2. 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






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






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






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






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






7. 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.






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






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






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






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






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






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






14. 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.






15. ___________________ 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






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






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






19. 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.






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






21. 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






22. An ___________ relates two other objects.






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






24. Are a data mining technology.






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






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






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






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






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






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






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






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






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






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






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






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






37. A synonym for data mining






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






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






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






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






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






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






44. 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) ____________.






45. 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 ________________.






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






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






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






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