TABLE 11-5
Four surgical procedures currently are used to install pacemakers. If the patient does not need to return for follow-up surgery, the operation is called a "clear" operation. A heart center wants to compare the proportion of clear operations for the four procedures, and collects the following numbers of patients from their own records:

They will use this information to test for a difference among the proportion of clear operations using a chi-square test with a level of significance of 0.05.
-Referring to Table 11-5, the decision made suggests that the four procedures do not all have the same proportion of clear operations.

Question

TABLE 11-5
Four surgical procedures currently are used to install pacemakers. If the patient does not need to return for follow-up surgery, the operation is called a "clear" operation. A heart center wants to compare the proportion of clear operations for the four procedures, and collects the following numbers of patients from their own records:
  
They will use this information to test for a difference among the proportion of clear operations using a chi-square test with a level of significance of 0.05.
-Referring to Table 11-5, the decision made suggests that the four procedures do not all have the same proportion of clear operations.

Quizplus · Accepted Answer

The decision to reject the null hypothesis (that the proportions of clear operations are equal for all four procedures) suggests that there is evidence of a difference among the proportion of clear operations for the four procedures. Therefore, the statement "the four procedures do not all have the same proportion of clear operations" is true.

TABLE 11-5 Four Surgical Procedures Currently Are Used to Install Pacemakers. If