DSCI4520PracticeExam1_fa10

# DSCI4520PracticeExam1_fa10 - DSCI 4520/5240 PRACTICE FOR...

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1 DSCI 4520/5240 Dr. Nick Evangelopoulos PRACTICE FOR EXAM 1 PART I – MULTIPLE CHOICE QUESTIONS 1. Data mining problems often involve the prediction of a target event shared by a very small fraction of the entire population. Suppose such a proportion is equal to 1%. Then, in order to obtain a sizeable sample corresponding to that target event we sample 1,000 observations where the target event occurred and 3,000 observations where the target event did not occur. This sampling technique is called A. Stratified sampling C. Random sampling B. Separate sampling or oversampling D. Independent sampling 2. Refer to question 1. After fitting a default regression model and a stepwise regression model, you create a Cumulative %Response chart, without specifying any prior probability. The %Response value of the baseline at the 20th percentile would be A. Equal to the non-cumulative %Response value at the 10 th percentile, plus the non- cumulative %Response value at the 20 th percentile B. Equal to 1%

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DSCI4520PracticeExam1_fa10 - DSCI 4520/5240 PRACTICE FOR...

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