Question: An herbal supplement is advertised as producing an increase in stamina. To test this claim, a sample of n = 16 adults is obtained and each person is instructed to take the regular daily dose of the supplement for 30 days. At the end of the 30-day period, each person is tested on a standard treadmill task for which the average, age-adjusted score is = 100. The individuals in the sample produce a mean score of M= 121 with SS = 6000. Are these data sufficient to conclude that the herb has a statistically significant effect on stamina at the p < .01 significance level?