A machine that fills cereal boxes is supposed to put 500 grams of cereal in each box. A simple random sample of 9 boxes is found to contain a sample mean of 490 grams of cereal. It is known from past experience that the fill weights are normally distributed with a standard deviation of 5 grams.
Construct a 90% confidence interval for the mean fill weight.
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Expert's answer
2020-12-01T15:09:16-0500
Population standard deviation is known, thus, Z is used.
"CI=\\bar X \\pm Z_{\\frac{\\alpha}{2}}\\frac{\\sigma}{\\sqrt{n}}"
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