Answer :
Final answer:
The margin of error for the confidence interval (2.31, 3.88) is calculated as (3.88 - 2.31) / 2 = 0.785, corresponding to option B in your list.
Explanation:
The margin of error in a confidence interval can be found by subtracting the lower value in the interval from the higher one, and then dividing the result by two. In this case, the confidence interval is given as (2.31, 3.88). Performing the calculation:
(3.88 - 2.31) / 2 = 0.785
Therefore, the margin of error for this confidence interval is 0.785, which corresponds to option B in your list. This means that the true population parameter lies within 0.785 of the sample statistic at the given confidence level.
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