A study was conducted to determine if taking a popularly advertised herbal suppl

Question

A study was conducted to determine if taking a popularly advertised herbal supplement will result in weight loss in obese males. A random sample of clinically obese males was obtained. Each subject was weighed before taking the supplement and again after 60 days using the supplement. Subjects were told not to alter their diet in any way during the study period.

What are the appropriate hypotheses to use in this case to determine if the herbal supplement is effective in achieving weight loss in obese males?

H0: ?D = 0 and Ha: ?D  ? 0

H0: ?D = 0 and Ha: ?D > 0

H0: ?D = 0 and Ha: ?D < 0

H0: ?D = 0 and Ha: ?D  ? 0

H0: ?D = 0 and Ha: ?D > 0

H0: ?D = 0 and Ha: ?D < 0

Explanation / Answer

Since under null hypothesis the difference in mean weights would be zero, therefore muD=0 while it is to be tested for effectiveness in weight of obese males, therefore alternative hypothesis is that muD is less than 0, because mean weight now after use of drug would be decreased. Therefore option C.

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