## 9.13Optional: Tests for ORs

A study (Tanagawa and Shigematsu 1998) examined the choice of airway devices used for nontraumatic, out-of-hospital cardiac arrest patients, to evaluate the success and failure of insertion for various devices.

The data for success and failure at insertion is given in Table 9.5, taken from available patient documentation.

TABLE 9.5: Data from the airways study
Succeed Fail
Esophageal gastric tube airway (EGTA) 545 49
1. Define $$p$$ as the population proportion of successful attempts at insertion. Write the hypotheses to be tested.