QUESTION 9 The owner of a coffee shop has found that the average amount spent by 25 customers at the shop is $6.80. Based on a large number of similar studies, it is known that the variance for the amount spent by all customers is 1.96 $2. What is the 90% confidence interval for the population mean amount spent by customers? 6.15 μ< 7.44 µ< 7.26 6.67 μ< 6.93 O 6.71 <<6.89 (a) 6.34

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