heathermcdonel
heathermcdonel heathermcdonel
  • 16-05-2018
  • Mathematics
contestada

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 20 hours. The population standard deviation is 2 hours. What is the 95% confidence interval for the mean?

A.19.88−20.12 hours
B.19.76−10.24 hours
C.19.88−20 hours
D.20−20.12 hours

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rasleen
rasleen rasleen
  • 16-05-2018
The answer is b because
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