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.  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.   A B C D   Clear 27 41 21 7   Return 11 15 9 11   Total 38 56 30 18               State the null hypothesis: State the alternative hypothesis The p value is  What is your conclusion?

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