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






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






3. ___________________ 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






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






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






6. 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.






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






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






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






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






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






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






13. 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) ____________.






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






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






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






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






18. An ___________ relates two other objects.






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






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






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






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






23. 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






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






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






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






27. 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:






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






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






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






31. _________ 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.






32. 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 ________________.






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






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






35. 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.






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






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






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






39. 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)






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






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






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






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






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






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






46. Are a data mining technology.






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






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






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






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