Based on a survey conducted by greenfield online, 25–34-year-olds spend the most each week on fast food. the average weekly amount of $44 (based on 115 participants) was reported in a may 2009 usa today snapshot. assuming that weekly fast-food expenditures are normally distributed with a known standard deviation of $14.50, construct a 90% confidence interval for the mean weekly amount that 25–34-year-olds spend each week on fast food.
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