NPTEL | DATA MINING | WEEK-3

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NPTEL

DATA MINING

WEEK-3

  1. Internal nodes of the decision tree correspond to:

    1. Attributes

    2. Classes

    3. Data instances

    4. None of the above


  1. In a multiclass classification problem, the Bayes classifier assigns an instance to the class corresponding to:

    1. Highest aposteriori probability

    2. Highest apriori probability

    3. Lowest aposteriori probability

    4. Lowest apriori probability


  1. Three identical bags contain blue and yellow balls. The first bag contains 3 blue and 2 yellow balls, the second bag gas 4 blue and 5 yellow balls, and the third bag has 2 blue and 4 yellow balls. A bag is chosen randomly and a ball is chosen from it. If the ball that is drawn out is blue, what will be the probability that the second bag is chosen?

    1. 15/62

    2. 27/62

    3. 10/31

    4. None of these



  1. What is the entropy of the dataset?

    1. 0.5

    2. 0.94

    3. 1

    4. 0


  1. Which attribute would information gain choose as the root of the tree?

    1. Age

    2. Income

    3. Student

    4. Credit rating


  1. Whether a person will buy if {Age=35, Student=No, Income=Low, Credit_rating=Fair}?

    1. Yes

    2. No

    3. The example can't be classified

    4. Both classes are equally likely


  1. What class does the person{Age=42, Student=No, Income=Medium, Credit_rating=Excellent}?

    1. Yes

    2. No

    3. The example can not be classified

    4. Both classes are equally likely


  1. What class does the person {Age=25, Student=No, Income=Medium Credit_rating=Fair}?

    1. Yes

    2. No

    3. The example can not be classified

    4. Both classes are equally likely


  1. Which attribute would information gain choose for Age=31-40?

    1. Student

    2. Income

    3. Is a leaf node with the value Yes.

    4. Credit_rating

Updated on February 15, 2023, at 12:40 AM

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