Jennifer Is a Quality Control Inspector for a Well-Known Computer

Jennifer is a quality control inspector for a well-known computer modem manufacturer.Jennifer oversees five assembly lines; each assembly line produces the same number of modems per day.Jennifer randomly selects one assembly line each morning and performs further sampling and quality control procedures on that assembly line's modems for the rest of the day.This morning,Jennifer randomly selected the modems of assembly line #5 for quality control inspection.Futhermore,Jennifer will then perform systematic sampling on that assembly line's modems.What has been excluded from being in the sampling frame today?

A) Some of the modems of assembly line #5
B) An unbiased sample for assembly line #5
C) The modems of assembly lines #1,2,3,and 4
D) A sampling method for assembly line #5
E) Nothing has been excluded from the sampling frame