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 sigma, the standard deviation of the duration times of game play. Assume that this sample was obtained from a population with a normal distribution. 4511 4123 4071 3965 4928 4453 4113 4613 3958 4671 4594 4666
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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 (sigma sign), the standard deviation of the duration times of game play. Assume that this sample was obtained from a population with a normal distribution. 4873, 4115, 4160, 4163, 4735, 4775, 4604, 4901, 4330, 4509, 5047, 4231
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Twelve different video games showing substance use were observed and the durations 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 98% 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. 4,501 4,512 4,306 4,413 5,040 4,046 4,318 4,842 4,799 4,990 4,807 4,622 The confidence interval estimate is ___ sec < σ < ___ sec.
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Assume that we will use the sample data from Exercise 1 "Video Games" with a 0.05 significance level in a test of the claim that the population mean is greater than 90 sec. If we want to construct a confidence interval to be used for testing that claim, what confidence level should be used for the confidence interval? If the confidence interval is found to be 21.1 sec $<\mu<191.4$ sec, what should we conclude about the claim?
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