Shoppers are invited to complete an online survey - HSC - SSCE Mathematics Standard - Question 3 - 2024 - Paper 1

The survey method described invites shoppers to voluntarily participate. This aspect indicates that individuals choose whether or not to take part based on their interest. This is characteristic of self-selecting sampling. In self-selecting sampling, the participants determine their participation, which often results in a biased sample, as it tends to attract those with strong opinions or interests in the subject matter.