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






2. 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 ________________.






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






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






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






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






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






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






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






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






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






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






13. 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.






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






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






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






17. A synonym for data mining






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






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






20. Are a data mining technology.






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






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






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






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






25. ___________________ 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






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






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






28. 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)






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






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






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






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






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






35. An ___________ relates two other objects.






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






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






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






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






40. 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:






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






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






43. 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






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






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






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






47. _________ 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.






48. 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






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






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







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