## NPTEL Data Mining Week 1 Assignment Answers 2024

1. The earliest step in the data mining process is usually?

a) Visualization

b) Preprocessing

c) Modelling

d) Deployment

Answer :-

2. Which of the following is an example of continuous attribute?:

a) Height of a person

b) Name of a person

c) Gender of a person

d) None of the above

Answer :-

3. Friendship structure of users in a social networking site can be considered as an example of:

a) Record data

b) Ordered data

c) Graph data

d) None of the above

Answer :-

4. Name of a person, can be considered as an attribute of type?

a) Nominal

b) Ordinal

c) Interval

d) Ratio

Answer :-

5. A store sells 15 items. Maximum possible number of candidate 2-itemsets is:

a) 120

b) 105

c) 150

d) 2

Answer :-

6. If a record data matrix has reduced number of rows after a transformation, the transformation has performed:

a) Data Sampling

b) Dimensionality Reduction

c) Noise Cleaning

d) Discretization

Answer Q7-Q10 based on the following table:

Customer ID | Transaction ID | Items Bought |

1 | 1 | {a,d,e} |

1 | 2 | {a,b,c,e} |

2 | 3 | {a,b,d,e} |

2 | 4 | {a,c,d,e} |

3 | 5 | {b,c,e} |

3 | 6 | {b,d,e} |

4 | 7 | {c,d} |

4 | 8 | {a,b,c} |

5 | 9 | {a,d,e} |

5 | 10 | {a,b,e} |

Answer :-

7. Taking transaction ID as a market basket, support for each itemset {e}, {b,d}, and {b,d,e} is:

a) 0.8, 0.2, 0.2

b) 0.3, 0.3, 0.4

c) 0.25, 0.25, 0.5

d) 1,0,0

Answer :-

8. Based on the results in (7), confidence of association rules {b,d}->{e} and {e}->{b,d} are:

a) 0.5, 0.5

b) 1, 0.25

c) 0.25, 1

d) 0.75, 0.25

Answer :-

9. Repeat (7) by taking customer ID as market basket. An item is treated as 1 if it appears in at least one transaction done by the customer, 0 otherwise. Support of itemsets {e}, {b,d}, {b,d,e} are:

a) 0.3, 0.5, 0.2

b) 0.8, 1, 0.2

c) 1, 0.2, 0.8

d) 0.8, 1, 0.8

Answer :-

10. Based on the results in (9), confidence of association rules {b,d}->{e} and {e}->{b,d} are:

a) 0.8, 1

b) 1, 0.8

c) 0.25, 1

d) 1, 0.25

Answer :-