Using Weka - First Example We Ran

We created a .arff file with the following small sample data-set about housing. It has six attributes - housingSize, lotSize, bedrooms, granite, bathroom and sellingPrice.

Selecting this arff file in Weka Explorer :

Selecting the Linear Regression classifier, 

We used help from the following link: http://www.ibm.com/developerworks/library/os-weka2/