(06.03 MC)
An experiment was conducted to test the effect of a new cholesterol medicine. Fifteen people were treated with medicine X and 15 with medicine y for a month; then
the subjects' cholesterol level was measured. A significance test was conducted at the a = 0.01 level for the mean difference in cholesterol levels between medicine >
and medicine Y. The test resulted in t = 2.73 and p = 0.003. If the alternative hypothesis in question was Ha HX-HY = 0, where x equals the mean cholesterol level
for subjects taking medicine X and My equals the mean cholesterol level for subjects taking medicine Y, what conclusion can be drawn?
There is sufficient evidence that there is a difference in mean cholesterol level when using medicine X and medicine Y

There is not a significant difference in mean cholesterol level when using medicine X and medicine Y

There is sufficient evidence that medicine X lowers cholesterol levels more than medicine Y

The proportion of subjects who lowered their cholesterol level with medicine X is greater than the proportion of subjects who lowered their cholesterol level with medicine Y

There is insufficient evidence that the proportion of people who lowered cholesterol level on medicine X and Y is different