A soda manufacturer is interested in determining whether its bottling machine tends to overfill. Each bottle is supposed to contain 12 oz of fluid. A random sample of size 36 is taken from bottles coming off the production line, and the contents of each bottle are carefully measured. It is found that the mean amount of soda for the sample of bottles is 12.1 oz. Suppose that the standard error for the mean amount of soda is 0.08. (1) What is the population parameter of interest in this study? Give a point estimate for the population parameter. (2) Give a 95% confidence interval for the population parameter and interpret the confidence interval. (3) Is the machine overfilling? Explain.

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A soda manufacturer is interested in determining whether its bottling machine tends to
overfill. Each bottle is supposed to contain 12 oz of fluid. A random sample of size 36 is taken
from bottles coming off the production line, and the contents of each bottle are carefully
measured. It is found that the mean amount of soda for the sample of bottles is 12.1 oz. Suppose
that the standard error for the mean amount of soda is 0.08.
(1) What is the population parameter of interest in this study? Give a point estimate for the
population parameter.
(2) Give a 95% confidence interval for the population parameter and interpret the confidence
interval.
(3) Is the machine overfilling? Explain.

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