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 statement will take away user privileges to the database?






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






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






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






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






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






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






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






9. 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) ____________.






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






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






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






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






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






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






16. 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.






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






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






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






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






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






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






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






24. 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






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






26. Generally Semantic Object Modeling (SOM) is consideredmore bottom-up oriented than _____________.






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






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






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






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. 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 ________________.






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






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. An ___________ relates two other objects.






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






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






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






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






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






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






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






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






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






44. A synonym for data mining






45. 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:






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






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






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






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






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