Question: The manufacturer of an airport baggage scanning machine claims it can handle an average of 530 bags per hour.

1. At α = . 05 in a left-tailed test, would a sample of 16 randomly chosen hours with a mean of 510 and a standard deviation of 50 indicate that the manufacturer’s claim is overstated?
2. Why might the assumption of a normal population be doubtful? (See Aviation Week and Space Technology 162, no. 4 ( January 24, 2005 ), p. 42.)

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