Aresearch firm wants to compute an interval estimate with 90% confidence for the mean time to complete an employment test. assuming a population standard deviation of three hours, what is the required sample size if the error should be less than a half hour?

What does it mean to say that "service sector" jobs are predominant in europe's mixed economies today? a. that jobs where people work in factories predominate b. that jobs where people do something for others predominate c. that jobs where people work the land predominate d. that jobs in government predominate

Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?

Which of the following best describes the reason the state department is interested in foreign exchange programs?