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Confidence interval for the true mean

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Reference no: EM131555259

A gas station sold a total of 8019 gallons of gas on nine randomly picked days. Suppose the amount sold on a day is normally distributed with a true standard deviation σ = 90. 

Construct a 99% confidence interval for the true mean μ. 

Can you conclude that the true mean amount of gas sold on a day is less than 900 gallons? Use α = 0.05

Please show all work.

Reference no: EM131555259

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