A Perth journalist wanted to write an article on the latest smart watches. In January 2021, he physically visited one major retailer in Perth, and looked at the smart watches sold by that retailer, noting the brand name, model, recommended retail price ($), battery life (days) and warranty (months). He then completed the in February 2021. 

a)Describe the "5W's" and the "How" of the data.

b) Do you feel that the sample collected by the journalist would suffer from any error? Briefly explain.