SCENARIO 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.
-True or False: Referring to Scenario 12-5, the null hypothesis will be rejected.

Question

SCENARIO 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.
-True or False: Referring to Scenario 12-5, the null hypothesis will be rejected.

Quizplus · Accepted Answer

The null hypothesis states that there is no difference between the two groups. The t-test statistic is -2.57, which is less than the critical value of -2.064. This means that the null hypothesis is rejected and we can conclude that there is a difference between the two groups.

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