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






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






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






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






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






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






7. 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)






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






9. An ___________ relates two other objects.






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






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. _________ 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.






14. 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:






15. 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






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






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






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






19. A synonym for data mining






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






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






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






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






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






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






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






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






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






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






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






31. 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.






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






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






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






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






36. 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






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






38. 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) ____________.






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






40. 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.






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






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






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






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






46. ___________________ 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






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






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






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






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