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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






16. 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)






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






18. An ___________ relates two other objects.






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






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






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






22. 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:






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






24. 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.






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






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






27. Are a data mining technology.






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






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






30. 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






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






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






33. 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.






34. 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.






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






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






37. 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 ________________.






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






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






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






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. _________ 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.






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






44. ___________________ 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






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






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






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






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






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






50. A synonym for data mining