Tribulus is a food supplement that some athletes us to enhance performance. A study on the effects of this supplement randomly assigned 31 athletes to take the supplement for a 20-day period and compared various characteristics to 41 similar athletes who were not given Tribulus. On the AAMP (anaerobic alactic muscle power) measurement, the mean for the Tribulus group was 1305.6 with a standard deviation of 177.3 and the mean for the control group was 1255.9 with a standard deviation of 66.8. The researchers are trying to determine whether the use of the supplement Tribulus has any effect on the mean AAMP measurement score. The researchers plan on doing statistical inference with the sample data. Sample sizes are large enough to us a t -distribution.

\f