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






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






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






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






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






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






7. ___________________ 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






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






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






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






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






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






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






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






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






16. 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






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






18. 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)






19. 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






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






21. 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 ________________.






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






23. A synonym for data mining






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






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






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






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






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






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






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






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






32. An ___________ relates two other objects.






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






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






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






36. Organizes and analyzes data as an n-dimensional cube. The cube can be thought of as a common spreadsheet with two extensions: (1) support for multiple dimensions and (2) support for multiple concurrent users.






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






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






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






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






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






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






44. 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) ____________.






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






46. Are a data mining technology.






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






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






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






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