Sampling shoppers A marketing consultant observes $50$ consecutive shoppers at a supermarket, recording how much each shopper spends in the store. Explain why it would not be wise to use these data to carry out a significance test about the mean amount spent by all shoppers at this supermarket.

Given in the question that, A marketing consultant observes $50$consecutive shoppers at a supermarket, we have to Explain why it would not be wise to use these data to carry out a significance test about the mean amount spent by all shoppers at this supermarket.

A convenient sample is a non-probability sampling method in which the sample is taken from a group of people who are easy to touch or encounter. A convenience survey, for example, would entail standing outside a mall or a grocery store and asking customers to complete questionnaires. This kind of sampling is also known as grab sampling or availability sampling. The poll is a choice study, as the shoppers were chosen because they were "conveniently" consecutive.

There would also be shoppers who went shopping on the same day of the week and at the same time, implying that a segment of the population was left out.