Twelve different video games showing substance use were observed and the duratio

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 a 90% confidence interval estimate of sigma, the standard deviation of the duration times of game play. Assume that this sample was obtained from a population with a normal distribution. The confidence interval estimate is Dec The confidence interval estimate is sec

Explanation / Answer

margin of error = z-score * standard deviation

= 1.645 * 311.533

= 512.47

lower bound = 4504.5 - 512.47 = 3992

upper bound = 4504.5 + 512.47 = 5017

4653 4689 4821 3854 4169 4857 4269 4485 4512 4626 4264 4855 mean 4504.5 standard deviation 311.5330

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