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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A magazine 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 34 ships that carry fewer than 500 passengers resulted in an average rating of
85.17, and a sample of 44 ships that carry 500 or more passengers provided an average rating of 81.80. 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? (Use smaller cruise ships - larger cruise ships.)
(b) At 95% confidence, what is the margin of error? (Round your answer to two decimal places.)
(c) What is a 95% confidence interval estimate of the difference between the population mean ratings for the two sizes of ships?
(Use smaller cruise ships - larger cruise ships. Round your answers to two decimal places.)
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Follow-up Question

A magazine 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 34 ships that carry fewer than 500 passengers resulted in an average rating of 85.17, and a sample of 44 ships that carry 500 or more passengers provided an average rating of 81.80. 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? (Use smaller cruise ships − larger cruise ships.)

(b)

At 95% confidence, what is the margin of error? (Round your answer to two decimal places.)

(c)

What is a 95% confidence interval estimate of the difference between the population mean ratings for the two sizes of ships? (Use smaller cruise ships − larger cruise ships. Round your answers to two decimal places.)

Solution