In the study by Silver and Aiello (A-4) cited in Example 12.4.2, a secondary objective was to determine if the frequency of falls was independent of wheelchair use. The following table gives the data for falls and wheelchair use among the subjects of the study.

Wheelchair Use Yes No Fallers 62 121 Nonfallers 18 32 Source: J. K. Silver and D. D. Aiello, “Polio Survivors: Falls and Subsequent Injuries,” American Journal of Physical Medicine and Rehabilitation, 81 (2002), 567–570.

Do these data provide sufficient evidence to warrant the conclusion that wheelchair use and falling are related? Let a ¼ .05.