Question

Pete is conducting a survey to determine his customers overall satisfaction about the quality of his company's products. He sends out surveys to the 5 customers who have purchased the largest number of items over the past year.Are his results likely to be representative of the population he is trying to analyze? Explain.

Answer 1

The sample size is too small. Only sending the survey to his best customers will create biased results, in the surveyor's favor. 

Answer 2

The answer is no it is not likely. He  should choose the customers randomly.