A study was conducted to determine if taking a popularly adv

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. The following table shows the observed results for the six subjects. With a = 0.05, what observed values of the test statistic would cause the sample results to be declared statistically significant? z > 1.645 t > 1.796 |t| > 2.571 z > 1.960 t > 2.015

Solution

Note that this is a one tailed paired t test.

As there are 6 subjects here, then df = n - 1 = 5.

Thus, using table/technology, for a right tailed test,

tcrit = 2.015048373

Thus, statistical significance is when

t > 2.015 [OPTION E]