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
X and medicine Y. The test resulted in t = 2.73 and p = 0.003. If the alternative
hypothesis in question was Ha: MX - My * 0, where my 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? (2 points)
1) There is sufficient evidence that there is a difference in mean cholesterol
level when using medicine X and medicine Y.

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

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

4) 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.

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