Air travelers often complain that recirculated air in the cabin leads to the spread of colds, while the airline industry generally disputes this claim. A 2002 study in the J. Am. Med. Assoc. reported the following information for passengers on flights with and without recirculated air:

Assume these represent independent random samples from the two relevant populations. Does the data suggest that the likelihood of catching a cold is higher on flights with recirculated air? Test at the α =.05 significance level.

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Recirculated air on the flight? Yes No Post-flight respiratory symptoms? Yes 111 108 No 472 409