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4. Consider a sample of 22 households that used an average of 346.2 gallons of water per day, with a standard deviation of 50.5 gallons

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4. Consider a sample of 22 households that used an average of 346.2 gallons of water per day, with a standard deviation of 50.5 gallons of water. Assumer the population of household water usage is normally distributed. Construct an 80% confidence interval for the mean

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