n the general population, patients who are recovering from bronchial pneumonia normally take a mean (average) of 4.75 days toleave the hospital, with apopulation standard deviationof 1.82 days.Medical personnel at a hospital are trying a newmedication that is designed to ease breathing during recovery. What is not currently known is whether the new medication willimpact duration of hospital stay. The first sample of 25 patients (n=25) to whom this medication was administered werereleased from the hospital in a mean (average) of 2.60 days. Based on this result, should the hospital conclude that there isasignificant differencein duration of hospital stay because of the new medication?

Which of the following is the calculated/obtained test statistic for this problem?

t =1.96

z =1.96

t =5.91

z =5.91

z =2.71