Sue stands outside a grocery store on the north side of her town and surveys exiting shoppers about their preference in frozen breads. What type of sampling technique does Sue's survey represent

In simple words, The non probability sampling refers to the sampling methods that really aren't designed to be utilized in terms of statistics to deduce from its sample to the general population. Conversely, theoretical framework can be produced by iterative non probability sampling, for instance, there till saturation point is achieved.

Such sampling techniques are highly preferred when the population is low in numbers and do not take much time to collect data from. The conclusions from such data is usually better than other techniques.