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






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. 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 ________________.






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






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






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






7. Are a data mining technology.






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






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






10. 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:






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






28. 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) ____________.






29. 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.






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






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






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






33. 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






34. ___________________ 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






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






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






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






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






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






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






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






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






43. An ___________ relates two other objects.






44. A synonym for data mining






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






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






47. 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.






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






49. 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.






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