Final answer:
Testing and sampling a product before it goes on display helps to ensure product quality and customer satisfaction.
Step-by-step explanation:
The best reason for a sales associate to test and sample a product before it goes on display is to ensure the product meets quality standards. By testing the product, the sales associate can identify any flaws or issues and make improvements, ensuring that the product is of high quality and meets customer expectations. This helps to build trust with customers and maintain a positive reputation for the brand or store.