A researcher records the number of calls received by a switchboard during a one-minute period. These one-minute intervals are chosen at evenly spaced times during a working week. The data set obtained by the researcher is shown in DS 6.1.6.
(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?