Calculate the upper confidence interval of the true population mean from the following data set using a 90% confidence level: Observation 2 6 7 8 DATA 1.02 4.92 1.16 2.98 5.02 7.78 1.76 9.43 8.11 6.99 9.05 10 11 (Round to the nearest hundredth; place your answer in the box below)

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