ou are the manager of a local cinema, and want to investigate how much the verage customer spends on the concession stand. You take a sample of 26 ustomers, and you find a sample average of $9.38, with a sample standard deviation f $2.97. Using this information, you want to create a 80% confidence interval round the population mean. What is the upper bound (upper end) of the confidence terval in of your analysis?

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