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

(a) At ± = .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?

(b) Why might the assumption of a normal population be doubtful? (See Aviation Week and Space Technology 162, no. 4 (January 24, 2005), p. 42.)

#### Solution Preview

9.26)
The manufacturer of an airport baggage scanning machine claims it can handle an average of 530 bags per hour.
(a) At ± = .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?
(b) Why might the ...

#### Solution Summary

Test of hypothesis about mean of an airport baggage scanning machine claims.
H0: mu=> 530bags/Hr (Claim is not overstated)
Ha: mu < 530 bags/Hr (Claim is overstated)

where mu is the population mean number of bags per hour

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