Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.80. Compute and interpret a 95% upper confidence...

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Extracted text: Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.80. Compute and interpret a 95% upper confidence bound for the true mean porosity of a certain seam if the average porosity for 16 specimens from the seam was 4.89.