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Confidence interval for the population mean

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Reference no: EM132944452

The manufacturer of bags of cement claims that they fill each bag with at least 45.8 pounds of cement. Assume that the standard deviation for the amount in each bag is 4 pounds. A random sample of 20 bags is selected and the sample mean weight is 43.6.

a) Test the hypothesis at 99% confidence level and interpret your results.

b) Form a 90% confidence interval for the population mean.

Reference no: EM132944452

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