Data Mining Quiz1 ISZC415 - BITS PILANI WILP MTEC

Data Mining Quiz 1 ISZC415 - BITS PILANI WILP MTEC

1. 27, 0, 1, 2, 63, 61, 0, 13
The five number summary of the above sample is:
Select one:
a. 63, 27, 13, 2, 0
b. 0, 2, 13, 27, 63
c. 0, 1, 13, 27, 63
d. 0, 0.5, 7.5, 44, 63

Ans: d. 0, 0.5, 7.5, 44, 63

2. 50th percentile is same as

Select one:
a. weighted mean
b. midrange
c. median
d. mean

Ans: c. median

3. Validation set and test set contain the same samples.

Select one:
True
False

Ans: False

4. A boxplot can show outliers as small circles/points,

Select one:
True
False

Ans: True

5. Analysis of patterns for stock market prediction is an example of:

Select one:
a. evolution analysis
b. outlier analysis
c. correlation
d. characterization and discrimination

Ans: a. evolution analysis

6. Pearson's product moment correlation coefficient between two

variables can have values:

Select one:
a. 0 or any positive number
b. greater than or equal to -1 but less than or equal to +1
c. greater than 0 but less than one
d. 0 or positive but less than or equal to 1

Ans: b. greater than or equal to -1 but less than or equal to +1

7. Given two text documents, when we shuffle the words of any one of

the documents, the cosine similarity between the two texts will not

change.

Select one:
True
False

Ans: True

8. If all the tuples in a data set belong to a single class, then its

gini index is:

Select one:
a. 0.5
b. insufficient information to say anything
c. 0
d. 1

Ans: c. 0

9. The mapping of a value by min-max normalization is always in the

range [0,1]

Select one:
True
False

Ans: False

10. We always predict some amount or number in this kind of problems:

Select one:
a. classification
b. preprocessing
c. clustering
d. regression


Ans:  d. regression

11. Holistic measure can be derived from distributive measures

Select one:
True
False

Ans: False

12. If all the data values in a set of data are unique, then

Select one:
a. their is no mode
b. we can select any one number as mode
c. the median is the mode
d. all the numbers are modes

Ans: a. their is no mode


13. A boxplot is nothing but a visual representation of IQR

Select one:
True
False

Ans: False

14.10, 2, 3, 4, 5, 3, 4, 6, 2

How many modes are there?

Select one:
a. 2
b. 1
c. 3
d. 4

Ans: c. 3

15. 10, 2, 3, 4, 5
The midrange of the above sample set is:


Select one:
a. 3
b. 6
c. 7.5
d. 4


Ans: b. 6