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






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






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






5. 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






6. 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.






7. 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 ________________.






8. 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) ____________.






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






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






11. An ___________ relates two other objects.






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






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






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






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






17. 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.






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






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






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






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






22. Are a data mining technology.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






39. 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)






40. 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.






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






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






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






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






45. A synonym for data mining






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






47. 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:






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






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






50. Gives us an idea of the magnitude of errors. Actual value - estimated value.