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Twelve different video games showing substance use were observed and the duration of times of game...

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 a 95% confidence interval estimate of ,σ​, the standard deviation of the duration times of game play. Assume that this sample was obtained from a population with a normal distribution.

4022
4047
3989
4102
4055
4698
4591
3969
4700
4941
4324
4136


Math   Statistics-And-Probability   
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Answer #1

from above  95% confidence interval estimate of ,σ​ =242.420 ; 581.012

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