A study is conducted to test the hypothesis that people with glaucoma have higher-than-average blood pressure. The study includes 200 people with glaucoma whose mean SBP is 140 mm Hg with a standard deviation of 25 mm Hg.

Construct a 95% CI for the true mean SBP among people with glaucoma.

If the average SBP for people of comparable age is 130 mm Hg, is there an association between glaucoma and blood pressure?