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[#311] PCA works better if there is 1. A linear structure in the data 2. If the data lies on a curved surface and not on a flat surface 3. If variables are scaled in the same unit

(A) 1 and 2

(B) 2 and 3

(C) 1 and 3

(D) 1,2 and 3

(E) 1 and 2

(F) 2 and 3

(G) 1 and 3

(H) 1,2 and 3

Correct Answer

[#312] What is/are true about kernel in SVM? 1. Kernel function map low dimensional data to high dimensional space 2. It's a similarity function

(A) 1

(B) 2

(C) 1 and 2

(D) None of these

(E) 1

(F) 2

(G) 1 and 2

(H) None of these

Correct Answer

[#313] Which statement about outliers is true?

(A) outliers should be part of the training dataset but should not be present in the test data

(B) outliers should be identified and removed from a dataset

(C) the nature of the problem determines how outliers are used

(D) outliers should be part of the test dataset but should not be present in the training data

(E) outliers should be part of the training dataset but should not be present in the test data

(F) outliers should be identified and removed from a dataset

(G) the nature of the problem determines how outliers are used

(H) outliers should be part of the test dataset but should not be present in the training data

Correct Answer

(C) the nature of the problem determines how outliers are used
(G) the nature of the problem determines how outliers are used

[#314] Select the correct answers for following statements. 1. Filter methods are much faster compared to wrapper methods. 2. Wrapper methods use statistical methods for evaluation of a subset of features while Filter methods use cross validation.

(A) both are true

(B) 1 is true and 2 is false

(C) both are false

(D) 1 is false and 2 is true

(E) both are true

(F) 1 is true and 2 is false

(G) both are false

(H) 1 is false and 2 is true

Correct Answer

(B) 1 is true and 2 is false
(F) 1 is true and 2 is false

[#315] With Bayes classifier, missing data items are

(A) treated as equal compares.

(B) treated as unequal compares.

(C) replaced with a default value.

(D) ignored.

(E) treated as equal compares.

(F) treated as unequal compares.

(G) replaced with a default value.

(H) ignored.

Correct Answer

(B) treated as unequal compares.
(F) treated as unequal compares.