SOLUTION: Based on information from the US census Bureau, the mean travel time to work in minutes for all workers 16 years old and older was 25.3 minutes. A large company with officers in se

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Question 851716: Based on information from the US census Bureau, the mean travel time to work in minutes for all workers 16 years old and older was 25.3 minutes. A large company with officers in several states randomly samples 100 of its workers to ascertain their commuting times. the sample mean was 23.9 minutes, and the population standard deviation 6.39 minutes. at the 0.01 level of significance can it be conclude that the mean commuting time is less for this particular company?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

0.01 level of significance z = ± 2.576

80%	z = 1.28155

90%	z =1.645

92%	z = 1.751

95%	z = 1.96

98%	z = 2.326

99%	z = 2.576

 z = (23.9-25.3)/.639 = -2.1909 , within the confidence interval