# Question: A confidence interval for a population mean has length 20 a

A confidence interval for a population mean has length 20.

a. Determine the margin of error.

b. If the sample mean is 60, obtain the confidence interval.

c. Construct a graph similar to Fig. 8.6 on page 320.

a. Determine the margin of error.

b. If the sample mean is 60, obtain the confidence interval.

c. Construct a graph similar to Fig. 8.6 on page 320.

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