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Postoperative ileus (POI) is a form of gastrointestinal dysfunction that commonly occurs after abdominal surgery and results in absent or delayed gastrointestinal motility. Does rocking in a chair after abdominal surgery reduce postoperative ileus (POI) duration? Sixty-six postoperative abdominal surgery patients were randomly divided into two groups. The experimental group received standard care plus the use of a rocking chair while the control group received only standard care. For each patient, the postoperative time until first flatus (days) (an indication that the POI has ended) was measured. The results are tabulated here.
(a) Is there evidence that use of the rocking chair reduces POI duration (i.e., the time until first flatus)? Use a t test with a directional alternative with
(b) While the researchers hypothesized that the use of a rocking chair could reduce POI duration, it is not unreasonable to hypothesize that the use of a rocking chair could increase POI duration. Based on this possibility, discuss the appropriateness of using a directional versus nondirectional test. (Hint: Consider what medical recommendations might be made based on this research.)
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Find answer to questions in picture:VL(0+) and VL(t) for all t
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