Question

Twelve different video games showing substance use were observed and the duration of times of game play​ (in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. Use the sample data to construct

aa

90​%

confidence interval estimate of

sigmaσ​,

the standard deviation of the duration times of game play. Assume that this sample was obtained from a population with a normal distribution.

4025	4330	4022	3979	3,932	5,005
4476	4 644	4 904	4375	4,800	4,393

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Click the icon to view the table of​ Chi-Square critical values.

The confidence interval estimate is

nothing

secless than<sigmaσless than<nothing

sec.

​(Round to one decimal place as​ needed.)

Answer 1

The statistical software output for this problem is:

Hence,

90% confidence interval will be:

278.9 < σ < 578.3