Which Hypothesis Is Nondirectional

Which hypothesis is nondirectional?

A) Hospitals with an infection-control nurse will have fewer instances of sepsis among inpatients than hospitals without an infection-control nurse.
B) There will be a greater weight loss among dieting patients who receive a weekly supportive telephone call from a dietitian than among dieting patients who do not receive a weekly supportive phone call.
C) There will be a difference in stage of disease for prostate cancer among men who had an abnormal prostate-specific antigen screening compared with men who had an abnormal digital rectal examination screening.
D) Children who receive weekly counseling for 1 year after the death of a parent will perform better in school than children who do not receive weekly counseling after the death of a parent.

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