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Mathematics, 21.06.2019 20:50
An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.
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Mathematics, 22.06.2019 00:00
This summer the number of tourists in salem increased 4.5% from last years total of 426000. how many more tourists came to salem this summer
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Mathematics, 22.06.2019 03:30
Sections of prefabricated wood are each 5 1/3 feet long. how long are 7 1/2 sections placed end to end?
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