A data mining team hired by a marketing company built a model to predict which customers are likely to respond to a campaign. The company plans to send promotion letters based on the model.  The evaluation chart below shows the performance of the model (Response="Yes"). Given the results, assuming there are 200,000 customer names in the pool, how many letters should the company send and how should the company select customers for the promotion letter? why?

 

 

% Samples Found 100 80 60 40 20 0 O 20 40 60 % Samples Tested 80 100