All airline passengers must pass through security screenings, but some are subjected to
additional searches as well. Some travelers who carry laptops wonder if that makes them
more likely to be searched. Data for 420 passengers aboard a cross-country flight are
summarized in the table shown. Does it appear that being subjected to an additional search
is independent of carrying a laptop computer? Explain. 
Definitions:
Rung(s)
Logical levels in a ladder diagram, representing a series of connected electrical elements in control programming, like those in a PLC (Programmable Logic Controller).
True
A logical value indicating truth or acceptance in boolean logic or conditions.
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