NPTEL Data Mining Week 1 Assignment Answers 2025
1. Data mining is the process of finding valid, novel, useful, and ______________, patterns in large volume of data. Which of the following terms best fills the gap above?
A. voluminous
B. heterogeneous
C. actionable
D. noisy
Answer :- c
2. Which of the following is usually the last step in the data mining process?
A. Visualization
B. Preprocessing
C. Modeling
D. Deployment
Answer :- d
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3. Name of a movie, can be considered as an attribute of type?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
Answer :- For Answers Click Here
4. User rating given to a movie in a scale 1-10, can be considered as an attribute of type?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
Answer :-
5. Which of the following operations cannot be performed on interval attributes?
A. Distinctness
B. Order
C. Addition
D. Multiplication
Answer :-
6. Which of the following operations can be performed on ratio attributes?
A. Addition
B. Multiplication
C. Both of the above
D. None of the above
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7. Sales database of items in a supermarket can be considered as an example of:
A. Record data
B. Tree data
C. Graph data
D. None of the above
Answer :-
8. Rows of a data matrix storing record data usually represents?
A. Metadata
B. Objects
C. Attributes
D. Aggregates
Answer :-
9. Which of the following is an example of continuous attribute?
A. Weight of a person
B. Shoe size of a person
C. Gender of a person
D. None of the above
Answer :-
10. If a record data matrix has reduced number of columns after a transformation, the transformation has performed:
A. Data sampling
B. Dimensionality reduction
C. Noise cleaning
D. Discretization
Answer :-
11. 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
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2024 Week 1 Data Mining nptel Assignment Answers
1. The earliest step in the data mining process is usually?
a) Visualization
b) Preprocessing
c) Modelling
d) Deployment
Answer :- b
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 :- a
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 :- c
4. Name of a person, can be considered as an attribute of type?
a) Nominal
b) Ordinal
c) Interval
d) Ratio
Answer :- a
5. A store sells 15 items. Maximum possible number of candidate 2-itemsets is:
a) 120
b) 105
c) 150
d) 2
Answer :- b
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 :- b
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} |
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 :- c
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 :- b
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 :- c
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 :- b