Question

in a study of a weight loss program, 40 subjects lost a mean of 3.0 lb after 12 months. does the weight loss program have practical significance?
(1 point)

yes, because the mean weight loss of 3.0 lb after one year does seems to justify the program.

yes, because the weight loss program worked and the subjects lost a mean of 3.0 lb.

no, because the mean weight loss of 3.0 lb after one year does not seem to justify the program.

no, because the sample of 40 subjects was too small to determine if the program was useful.

Explanation:

Practical significance assesses if the result (3.0 lb weight loss) is meaningful in real - world terms. A 3.0 lb loss over a year is relatively small and may not justify the program. The sample size (40) is not the issue for practical significance (that's more for statistical significance). The first two options wrongly assume 3.0 lb is justifiable, and the last option confuses practical and statistical significance.

Answer:

C. No, because the mean weight loss of 3.0 lb after one year does not seem to justify the program.