quality control expert at a pretzel factory took a random sample of 10 bags from a production run of over 500 bags and measured the amount of pretzels in each bag in the sample.  The sample data were roughly symmetric with a mean of 450 g and a standard deviation of 15 g. Based on this sample, construct a 98% confidence interval for the mean amount of pretzels per bag (in grams) in this production run? please format to mean +- margin of error  and explain the steps of how to do this

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