A 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, which of the following is a 90% confidence interval for the mean amount of pretzels per bag (in grams) in this production run? Choose 1 answer: 450 + 4.743 450士7.803 450 8.695 450土15

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