A confidence interval for a population mean has a margin of error of 3.5. a. Determine the length of the confidence interval. b. If the sample mean is 47.8 , obtain the confidence interval. a. The length of the confidence interval is?

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Answer to a math question A confidence interval for a population mean has a margin of error of 3.5. a. Determine the length of the confidence interval. b. If the sample mean is 47.8 , obtain the confidence interval. a. The length of the confidence interval is?

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Gerhard

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a) Length of confidence interval: 2\times3.5=7 b) Confidence interval: 47.8-3.5=44.3

47.8+3.5=51.3

44.3 < \mu < 51.3

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