Transaction set:{(1,2,3,5), (2,4,5), (2,3,4,5)}. The confidence of the rule (5)->(3) is:​

• 66%

• 33%

• 50%

Sequential covering is used for

• Building decision trees

• Obtaining rules

• Clustering

When building a decision tree using C4.5, branching is made using the attribute that:

• Minimize the information gain

• Minimize the entropy

• Both a and b are true

KNN algorithm is for:

• Clustering

• Regression

• Classification

A decision tree can be converted in:

• A set of rules

• A single complex rule

• Both a and b are false

Hierarchical clustering produces a sequence of embedded clusters called:

• Dendogram

• Dendrogram

• Dondegram

Variance is:

• Square of σ

• Square root of σ

• Both a and b are false

K-Means is sensitive to:

• Outliers

• Initial centroids

• Both a and b are true

Fuzzy C-Means type is:

• Hard Clustering

• Soft clustering

• Mixed clustering

The standard deviation of (1,1,1,1,1) is:

• 1

• Between 1 and 2

• 0