(a) Is there a difference in the mean number of passengers bumped using software packages 1 and...

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(a) Is there a difference in the mean number of passengers bumped using software packages 1 and 2 from those using software packages 3 and 4? Test at the 10% level of significance.
(b) Find a 95% confidence interval for the contrast that tests for the difference in the mean number of passengers bumped using software package 3 and the average of those using software packages 1 and 2.
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