Patients with non chronic low back pain were randomly assigned to either a treatment group that received
Question:
(a) Calculate the sample effect size from these data.
(b) A 95% confidence interval for the difference in population mean Oswestry Disability Index for the two groups (µExperimental - µControl) is (- 8.2, 18.0) percentage points. The researchers were hoping to find a difference of at least 5 percentage points, a difference that they thought would be clinically important. Based on the confidence interval, would they be ill-advised to conduct a larger study in the hope of finding convincing evidence of a 5 percentage point difference?
(c) How would your answer to (b) change if the confidence interval was (- 2.4, 3.2) percentage points.
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Related Book For
Statistics For The Life Sciences
ISBN: 9780321989581
5th Edition
Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner
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