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. 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) ____________.






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






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






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






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






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






8. ___________________ 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






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






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






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






12. 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






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






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






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






16. 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.






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






18. A synonym for data mining






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






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






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






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






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






24. 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.






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






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






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






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






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






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






31. 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 ________________.






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






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






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






35. 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:






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






37. An ___________ relates two other objects.






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






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






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






41. 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)






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






43. Are a data mining technology.






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






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






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






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






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






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






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