The Cilia are hair like structures that line the nose and help to protect the respiratory tract from dust and foreign particles. A medical team obtained specimens of nasal tissue from nursery school children who had viral upper respiratory infections, and also from healthy children in the same classroom. The tissue was sectioned, and the cilia were examined with a microscopic for specific defects, with the results shown in the accompanying table. The data show that the percentage of defective cilia was much higher in the tissue from infected children (15.% versus 3.1%). Would it be valid to apply a chi-square test to compare these percentages? If so, do it. If not, explain why not.

Control Respiratory infection Number of children 7 22 Total number of cilia counted 556 1,493 Cilia with defects Number Percent 17 3.1 235 15.7