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 ( PSA ) screening compared with men who had an abnormal digital rectal examination ( DRE ) screening.
D) Children who receive weekly counseling for one 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.

Question

Quizplus · Accepted Answer

Correct C: This example includes a nondirectional hypothesis; there is no expected direction evident.
Incorrect A: This example includes a directional hypothesis; the expected direction is present (fewer).
Incorrect B: This example includes a directional hypothesis; the expected direction is present (greater).
Incorrect D: This example includes a directional hypothesis; the expected direction is present (better).

Which Hypothesis Is Nondirectional