Question

For Practice Ex: The following table contains information on gallbladder function in patients with presentations of gastroesophageal reflux disease before and after fundoplication - a surgery used to stop stomach contents from flowing back into the esophagus (reflux). We wish to know if these data provide sufficient evidence to allow us to conclude that fundoplication increases gallbladder functioning. Assume Postop-Preop differences are normally distributed; use 5% significance level. 22 63.3 96 9.2 3.1 50 33 69 64 18.8 0 34 ostop 63.5 91.5 59 37.8 10.1 19.6 41 87.8 (%) 86 55 88 40

Answer 1