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






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






3. 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.






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






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






6. 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:






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






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






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






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






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






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






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






14. Are a data mining technology.






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






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






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






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






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






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






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






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






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






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






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






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






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






28. 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.






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






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






31. 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)






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






33. An ___________ relates two other objects.






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






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






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






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






38. ___________________ 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






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






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






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






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






44. 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






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






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






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






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






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






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







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