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 function calculates the number of entries in a table?






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






3. 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:






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






5. 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.






6. A synonym for data mining






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






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






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






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






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






12. 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






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






14. 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)






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






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






17. Are a data mining technology.






18. _________ 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.






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






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






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






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






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






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






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






26. ___________________ 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






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






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






30. An ___________ relates two other objects.






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






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






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






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






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






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






37. 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.






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






39. 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 ________________.






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






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






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






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






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






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






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






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






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






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






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