Answer:
convenience sample
Explanation:
Convenience sampling is most important and is useful in pilot testing of a product.
It is a type of sampling, that is a non probability sampling in which a sample is taken for testing which is a part of a group of sample products which is close to hand. It is usually taken from the part which is easily accessible or easy to reach.
In the question, Gerrard asks his survey team to interview the customers who are readily accessible at their outlets. This gives an example of convenience sampling.
Thus the answer is --- convenience sample.
