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8 April, 00:18

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

+1
Answers (1)
  1. 8 April, 01:46
    0
    0.743 is the correct answer
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