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Historical data indicated that the time required to service the conveyor belt at Coca-Cola Amatil's Richlands...

Historical data indicated that the time required to service the conveyor belt at Coca-Cola Amatil's Richlands operations can be modelled as a normal distribution with a standard deviation of 15.7 minutes. A random sample of 27 services revealed a mean service duration of 122.1 minutes. Determine a 90% confidence interval for the mean service time in minutes. State the lower bound of this interval correct to two decimal places.

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Answer #1

Solution: Here concept of confidence interval for population mean is used.

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