To test the efficacy of a new cholesterol-lowering medication, 10 people are selected at random. Each has their LDL levels measured (shown below as Before), then take the medicine for 10 weeks, and then has their LDL levels measured again (After).

Subject	Before	After
1	144	147
2	159	134
3	175	180
4	195	163
5	151	143
6	174	138
7	116	99
8	173	156
9	188	195
10	116	76

Give a 96.6% confidence interval forBA, the difference between LDL levels before and after taking the medication.

Confidence Interval = at 96.6% confidence.

Give your answer as an open interval, in the form (A,B) where A is the lower bound and B is the upper bound.