Question

question 15 of 25
a 90% confidence interval is (35, 45). what is the margin of error?
a. 4.5
b. 10
c. 5
d. 9

Explanation:

Step1: Find the interval width

Width = Upper bound - Lower bound = $45 - 35 = 10$

Step2: Calculate margin of error

Margin of error = $\frac{\text{Width}}{2} = \frac{10}{2} = 5$

Answer:

C. 5