A study is conducted to test the hypothesis that people with glaucoma have higher than average blood pressure. The study includes 30 people with glaucoma whose mean SBP is 140 mm Hg with a standard deviation of 25 mm Hg. The distribution of SBP appears to be bell-shaped. You need to construct a 95% confidence interval for the true mean SBP among people with glaucoma. To help you do so, answer each of the following questions.

What is the standard error? (1 point)

Select one:

a. 1.64

b. 2.04

c. 4.56

d. 4.64

e. 5.00