A study of five hundred adults found that the number of hours they spend on social networking sites each week is normally distri buted with a mean of 14 hours. The population standard deviation is 3 hours. What is the margin of error for a 95% confidence interval?
1 answer:
Margin of error formula: ME = z * (Sigma) / √ n z = 1.96 for a 95 % confidence interval; Sigma = 3 ( the population standard deviation ) n = 500 ME = 1.96 * 3 / √500 = = 1.96 * 3 / 22.36 = = 5.88 / 22.36 = 0.263 Answer: The margin error for a 95% confidence interval is 0.263.
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