Many types of businesses use product samples to allow potential and prospective customers to experience their products in hopes of enticing them to buy. Restaurants, for example, might offer free ...

A sample is a product given to a potential customer for free by a manufacturer, distributor or retailer for testing with the intention of persuading them to buy the product. These customers are ...

This is a preview. Log in through your library . Abstract Purpose Measurement development in hard-to-reach populations can pose methodological challenges. Item response theory (IRT) is a useful ...