The management of a popular tourist resort in China had noticed a decline in the number of tourists and their length of stay over the past three years. Management decided to conduct a study to determine people's attitudes toward the particular activities that were available at a popular tourist resort. A request was deposited in each hotel room of the two major hotels in the resort, indicating the nature of the study and encouraging customers to participate. The customers were requested to report to a separate desk located in the lobby of the hotels. Personal interviews, lasting twenty minutes, were conducted at this desk.
a. What type of sampling method was used?
b. Critically evaluate the method used.