Question

question 4 of 10
a 90% confidence interval is found to be (32, 48). what is the margin of error?
a. 14.4
b. 16
c. 8
d. 7.2

Explanation:

Step1: Find the midpoint (sample mean)

The confidence interval is (lower, upper). The midpoint is $\frac{32 + 48}{2} = 40$.

Step2: Calculate margin of error

Margin of error = upper bound - midpoint = $48 - 40 = 8$.

Answer:

C. 8