Data Mining | Task Report | Assignment

Running head: WEKA 1
Data Mining
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Author’s Note

WEKA 2
Data Mining
Task 1: Weka data exploration
(a) How many instances and attributes (including the class attribute) does this dataset
have?
The dataset has 768 instances and 9 attributes. The attributes (includes 1 class attribute)
are Preg, Plas, Pres, Skin, Insu, Mass, Pedi, Age and Class. The following Figure
(Screenshot from Weka) demonstrates the mentioned 9 attributes and 768 instances.
(b) How many classes are present in the dataset and how many instances are there for
each class?
There are two classes present in the dataset. These are tested_negative and tested_positive.
The tested_positive has 268 instances while tested_negative has 500 instances as indicated
below:

WEKA 3
(c) Use histograms (with default settings) to show which age group has the highest
number of samples?
The Age Group with the highest number of samples (267 samples) is 21 to 25.6 years.
The Figure below confirms the finding.