MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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The increasing annual cost (including tuition, room, board, books, and fees) to attend college has been widely discussed.† The following random samples show the annual cost of attending private and public colleges. Data are in thousands of dollars.
Private Colleges
52.8 42.2 44.0 33.3 45.0
29.6 44.8 36.8 51.5 43.0
 
Public Colleges
20.3 22.0 28.2 15.6 24.1 28.5
22.8 25.8 18.5 25.6 14.4 21.8

 

(a)
Compute the sample mean (in thousand dollars) and sample standard deviation (in thousand dollars) for private colleges. (Round the standard deviation to two decimal places.)
 
sample mean = ?   thousand
sample standard deviation = ? thousand
 
Compute the sample mean (in thousand dollars) and sample standard deviation (in thousand dollars) for public colleges. (Round the standard deviation to two decimal places.)
 
sample mean = ? thousand
sample standard deviation= ?  thousand
 
(b)
What is the point estimate (in thousand dollars) of the difference between the two population means? (Use Private − Public.)
$  ? thousand
 
Interpret this value in terms of the annual cost (in dollars) of attending private and public colleges.
 
We estimate that the mean annual cost to attend private colleges is $  more than the mean annual cost to attend public college
(c)
Develop a 95% confidence interval (in thousand dollars) of the difference between the mean annual cost of attending private and public colleges. (Use Private − Public. Round your answers to one decimal place.)
$  thousand to $  thousand
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