How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 90% confidence that the sample mean is within 4 minutes of the population mean, and the population standard deviation is to known to be 12 minutes. A) 25 B) 35 C) 49 D) 60
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For a 90% confidence level, the Z-score is approximately 1.645 (you can find this value in a standard Z-score table). Given that Ļ is 12 minutes and E is 4 minutes, we can substitute these values into the formula: Sample size = (1.645*12/4)^2 = (4.935)^2 = Show moreā¦
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