Suppose that the average time spent per day with digital media several years ago was 3 hours and 13 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 99​% confidence interval for last​ year's mean time spent per day with digital media by adults of the region.​ (Note: x=5.46 hr and s=2.22 ​hr.)

MATLAB: An Introduction with Applications
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Suppose that the average time spent per day with digital media several years ago was

3

hours and

13

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

99​%

confidence interval for last​ year's mean time spent per day with digital media by adults of the region.​ (Note:

x=5.46

hr and

s=2.22

​hr.)

 

 

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