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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Suppose that the average time spent per day with digital media several years ago was
3
hours and
27
minutes. For last​ year, a random sample of
20
adults in a certain region spent the numbers of hours per day with digital media given in the accompanying table. Preliminary data analyses indicate that the​ t-interval procedure can reasonably be applied. Find and interpret a
95​%
confidence interval for last​ year's mean time spent per day with digital media by adults of the region.​ (Note:
x=5.45
hr and
s=2.20
​hr.)
Click here to view the digital media times.
LOADING...
Click here to view page 1 of the t-table.
LOADING...
Click here to view page 2 of the t-table.
LOADING...
 
 
 

Question content area bottom

Part 1
The
95​%
confidence interval is from
enter your response here
​hour(s) to
enter your response here
​hour(s).
​(Round to two decimal places as​ needed.)
Part 2
Interpret the
95​%
confidence interval. Select all that apply.
 
 
A.
With
95​%
​confidence, the mean amount of time spent per day on digital media last year by all adults in the region is between the​ interval's bounds.
 
B.
95​%
of all adults in the region spent amounts of time per day on digital media last year that are between the​ interval's bounds.
 
C.
95​%
of all possible random samples of
20
adults in the region have mean amounts of time spent per day on digital media last year that are between the​ interval's bounds.
 
D.
There is a
95​%
chance that the mean amount of time spent per day on digital media last year by all adults in the region is between the​ interval's bounds.
 
 
Digital Media Times
2.1
5.5
6.4
4.3
5.6
 
2.6
6.8
2.6
8.1
9.5
 
7.4
6.0
9.5
4.5
2.8
 
3.2
5.6
5.1
4.4
6.9
 

 

D
 
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