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OpenStudy (anonymous):
A study of one thousand teens found that the number of hours they spend on social networking sites each week is normally distributed with a mean of 30 hours. The population standard deviation is 2 hours. What is the 95% confidence interval for the mean? 29.76−30.24 hours 29.88−30 hours 30−30.12 hours 29.88−30.12 hours
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OpenStudy (anonymous):
@SuperflyTyGuy please help!
OpenStudy (superflytyguy):
The confidence limits are 30 plus or minus 1.96(2/square root of 1000) =29.88 and 30.12
OpenStudy (superflytyguy):
D
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