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The medical director of Mercy Hospital has asked a staff analyst to develop a 98% confidence interval estimate of the time required for a certain type of heart surgery. She would like to be accurate within + or - 6 min. Only 420 such operations have been performed nationwide. For the eight operations performed in the region of Mercy Hospital, X bar= 3.20 hr. and s = .30 hr. The analyst plans to take a random sample.
How large a sample should be?
n=(zs)/E^2=(2.33*0.3/0.1)^2 = 48.86 or 49 where E = 6 minutes or 6/60 = 0.1 hr.
Calculate the test statistic and the df - Write a conclusion, addressing the research question. Your conclusion should include an interpretation of the 95% confidence bound which is given in the above output
student of business is interested in estimating a 99 confidence interval for the proportion of students who bring
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A state representative is reported as saying that about 10% of reported auto thefts involve owners whose cars have not really been stolen, but who are trying to defraud their insurance company.
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