Exploring and Producing Data for Business Decision Making | Online Course Support

An automobile company wants to determine the average amount of time it takes a machine to assemble a car. A sample of 40 times yielded an average time of 23.92 minutes, with a sample standard deviation of 6.72 minutes. Assuming normality of assembly times, provide a 98% confidence interval for the mean assembly time. Use Z_{a/2}Za/2​ = 2.33 and round your answer to three decimal places.


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