I need to find the 97.3% confidence interval for this data. I keep getting it wrong

(1 point) 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 1 136 150 2 156 148 3 190 179 4 171 149 5 180 170 6 134 132 7 198 174 8 193 185 9 177 182 p-L CD 166 174