condé nast traveler conducts an annual survey in which readers rate their favorite cruiseship. All ships are rated on a 100-point scale, with higher values indicating better service.A sample of 37 ships that carry fewer than 500 passengers resulted in an average ratingof 85.36, and a sample of 44 ships that carry 500 or more passengers provided an averagerating of 81.40. Assume that the population standard deviation is 4.55 for ships that carryfewer than 500 passengers and 3.97 for ships that carry 500 or more passengers.a. What is the point estimate of the difference between the population mean rating forships that carry fewer than 500 passengers and the population mean rating for shipsthat carry 500 or more passengers?

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condé nast traveler conducts an annual survey in which readers rate their favorite cruise
ship. All ships are rated on a 100-point scale, with higher values indicating better service.
A sample of 37 ships that carry fewer than 500 passengers resulted in an average rating
of 85.36, and a sample of 44 ships that carry 500 or more passengers provided an average
rating of 81.40. Assume that the population standard deviation is 4.55 for ships that carry
fewer than 500 passengers and 3.97 for ships that carry 500 or more passengers.
a. What is the point estimate of the difference between the population mean rating for
ships that carry fewer than 500 passengers and the population mean rating for ships
that carry 500 or more passengers?

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