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OpenStudy (anonymous):
A study of three hundred teenagers found that the number of hours they spend on instant messaging sites each week is normally distributed with a mean of 13 hours. The population standard deviation is 5 hours. What is the margin of error for a 99% confidence interval? 0.743 0.334 0.320 0.413
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OpenStudy (anonymous):
its b
OpenStudy (anonymous):
Do you know why?
OpenStudy (anonymous):
one sec brb
OpenStudy (anonymous):
well because you gotta divide
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