TABLE 12-5
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 4 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 12-5, the null hypothesis will be rejected.

Question

TABLE 12-5
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 4 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 12-5, the null hypothesis will be rejected.

Quizplus · Accepted Answer

The question does not provide the actual data from which we can calculate the chi-square statistic or p-value to determine whether to reject or fail to reject the null hypothesis. However, based on the level of significance of 0.05, if the calculated p-value is less than 0.05, we would reject the null hypothesis. Therefore, we cannot determine the actual answer without performing the chi-square test, but we can only conclude that the null hypothesis will be rejected if the calculated p-value is less than 0.05.

TABLE 12-5 Four Surgical Procedures Currently Are Used to Install Pacemakers. If