Historical data indicated that the time required to service the
conveyor belt at Coca-Cola Amatil's Richlands...
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Historical data indicated that the time required to service theconveyor belt at Coca-Cola Amatil's Richlands operations can bemodelled as a normal distribution with a standard deviation of 20minutes. A random sample of 20 services revealed a mean serviceduration of 119.9 minutes. Determine a 90% confidence interval forthe mean service time in minutes. State the lower bound of thisinterval correct to two decimal places.
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Solution Given thatPoint estimate sample mean 1199sample standard deviation
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