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A 99% confidence interval is created to determine the population mean weight of college textbooks. The resulting interval is (2.45 lbs., 6.56 lbs.) based on

A 99% confidence interval is created to determine the population mean weight of college textbooks. The resulting interval is (2.45 lbs., 6.56 lbs.) based on a sample of 120 textbooks. Which of the following is the value of the margin of error for this interval?

4.11

2.055

2.575

0.798

4.505

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