How do consumers feel about using the Internet for online shopping? To find out, United Parcel Service (UPS) commissioned a nationwide survey of 5,118 U.S. adults who had conducted at least two online transactions in 2015. One finding from the study is that 74% of online shoppers have used a smartphone to do their shopping.

a. Identify the data-collection method.

b. Identify the target population.

c. Are the sample data representative of the population?