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Database - Data Mining

Avatto > > UGC NET Management > > PRACTICE QUESTIONS > > International Business , Data Mining , DataWarehousing, Artificial Intelligence > > Database > > Data Mining

61. You have been given the following 2 statements. Find out which of these options is/are true in case of k-NN?
1. In case of very large value of k, we may include points from other classes into the neighborhood.
2. In case of too small value of k, the algorithm is very sensitive to noise.

A
1 is True and 2 is False
B
1 is False and 2 is True
C
Both are True
D
Both are False

Answer
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Option : C
Explanation :

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62. Suppose you are given the following images (1 represents the left image, 2 represents the middle and 3 represents the right). Now your task is to find out the value of k in k-NN in each of the images shown below. Here k1 is for 1^st, k2 is for 2^nd and k3 is for 3^rd figure.

A
k1 > k2 > k3
B
k1 < k2 > k3
C
k1 < k2 < k3
D
None of these

Answer
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Option : C
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63. Which of the following necessitates feature reduction in machine learning?

A
Irrelevant and redundant features
B
Limited training data
C
Limited computational resources
D
All of the above

Answer
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Option : D
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64. Suppose, you have given the following data where x and y are the 2 input variables and Class is the dependent variable.

x	y	Class
-1	1	-
0	1	+
0	2	-
1	-1	-
1	0	+
1	2	+
2	2	-
2	3	+

Below is a scatter plot which shows the above data in 2D space.

Suppose, you want to predict the class of new data point x=1 and y=1 using Eucledian distance in 3-NN. In which class this data point belong to?

A
+Class
B
-Class
C
Can't say
D
None of these

Answer
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Option : A
Explanation :
All three nearest point are of +class so this point will be classified as +class.

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65. What are the optimum number of principal components in the below figure?

A
10
B
20
C
30
D
40

Answer
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Option : C
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