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






2. 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.






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






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






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






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






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






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






9. _________ 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.






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






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






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






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






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






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






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






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






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






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






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






21. 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:






22. Are a data mining technology.






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






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






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






26. A synonym for data mining






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






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






29. 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






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






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






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






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






35. 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.






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






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






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






39. ___________________ 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






40. 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.






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






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






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






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






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






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






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






48. 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






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






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