One Saturday a researcher recorded the times taken to serve customers at a fast-food restaurant. DS 6.1.4 shows the service times in seconds for all the customers who were served between 2:00 and 3:00 in the afternoon.
(a) Define the population from which the sample is taken. Do you think that it is a representative sample?
(b) Are there any other factors that should be taken into account in interpreting the data set? Are there any issues pertaining to the way in which the sample has been collected that you would want to investigate before interpreting the data set?