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






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






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






4. An ___________ relates two other objects.






5. A synonym for data mining






6. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






23. Are a data mining technology.






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






25. 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)






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






27. 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 ________________.






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






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. _________ 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.






31. 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






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






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






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






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






36. 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) ____________.






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






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






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






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






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






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






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






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






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






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






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






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






49. ___________________ 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






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