Question
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. True or False: Referring to Table 11-5, the null decision made suggests that the four procedures at have different proportions of clear operations. A. False B. True
Explanation / Answer
The statistical software output for this problem is:
Contingency table results:
Rows: var5
Columns: None
Chi-Square test:
Since p - value is less than 0.05, we reject the null hypothesis.
Hence,
Option A True is correct.
var6 var7 var8 var9 Total L 27 41 21 7 96 NL 11 15 9 11 46 Total 38 56 30 18 142