A study of 85 patients with Hodgkin's disease found that 41 had had their tonsils removed. Each patient w as matched with a sibling of the same sex. Only 33 of the siblings had undergone tonsillectomy. The data are shown in the following tabled Use McNemar's test to test the hypothesis that "yes/no" and "no/yes" pairs are equally likely. Previous research had suggested that having a tonsillectomy is associated with an increased risk of Hodgkin's disease: thus, use a directional alternative. Let α = 0.05.

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Sibling Tonsillectomy? Yes No Hodgkin's patient Yes 26 15 tonsillectomy No 7 37