In a test of a new surgical procedure,the five most respected surgeons in FlatBroke Township were invited to Carver Hospital.Each surgeon was assigned two patients of the same age,gender,and overall health.One patient was operated upon in the old way,and the other in the new way.Both procedures are considered equally safe.The surgery times are shown below: 
The time (in minutes) to complete each procedure was carefully recorded.In a right-tailed test for a difference of means,the test statistic is
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