(Solved): A confidence interval for a population mean has a margin of error of \( 2.8 \). a. Determine the l ...

A confidence interval for a population mean has a margin of error of \( 2.8 \). a. Determine the length of the confidence interval. b. If the sample mean is \( 54.6 \), obtain the confidence interval. c. Construct a graph that illustrates your results. a. The length of the confidence interval is (Type an integer or a decimal. Do not round.) b. The confidence interval for \( \mu \) is from to (Type integers or decimals. Do not round.) c. Choose the correct graph below. A. B. C. D.