Question

a clinic measured the systolic blood pressure for a random sample of 10 patients. the resulting 95% confidence interval for the mean systolic blood pressure of all the patients at this clinic was (111.3, 129.5). what was the margin of error for this confidence interval?○ 9.1○ 18.2○ 120.4○ 240.8

Explanation:

Step1: Calculate interval width

$129.5 - 111.3 = 18.2$

Step2: Find margin of error

$\frac{18.2}{2} = 9.1$

Answer:

9.1