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? a. 0.743 b. 0.334 c. 0.320 d. 0.413

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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? a. 0.743 b. 0.334 c. 0.320 d. 0.413

Mathematics
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whats the z-critical value for 99% confidence interval ?
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