A company packaging snack foods maintains quality control by randomly selecting 10 cases from each day’s production and weighing the bags. Then the quality control staff open one bag from each case and inspect the contents.

For the following reports about statistical studies, identify the following items (if possible). If you can’t tell, then say so—this often happens when we read about a survey.

a) The population

b) The population parameter of interest

c) The sampling frame

d) The sample

e) The sampling method, including whether or not randomization was employed

f) Any potential sources of bias you can detect and any problems you see in generalizing to the population of interest