Condé Nast Traveler conducts an annual survey in whichreaders rate their favorite cruise ship. All ships are rated on a100-point scale, with higher values indicating better service. Asample of 36 ships that carry fewer than 500 passengers resulted inan average rating of 85.33 , and a sample of 43 ships that carry500 or more passengers provided an average rating of 81.3. Assumethat the population standard deviation is 4.55 for ships that carryfewer than 500 passengers and 3.95 for ships that carry 500 or morepassengers.
A.) What is the point estimate of the difference between thepopulation mean rating for ships that carry fewer than 500passengers and the population mean rating for ships that carry 500or more passengers?
B.) At 95% confidence, what is the margin of error?
C.) What is a 95% confidence interval estimate of the differencebetween the population mean ratings for the two sizes of ships?
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